Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4ddc4816d41ba1…

MALICIOUS

PDF

98.6 KB Created: 2021-04-04 18:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0ae04c8fafdb799c48d4c2d14c3d3a13 SHA-1: 6cc489f6297bf84aa3670276e78953be0cdab584 SHA-256: bb4ddc4816d41ba13dfa0758648b69d6d3f1bedec097b1b002373cadc50a516e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/123?utm_term=vocabulary+words+pdf+for+sbi+po PDF link annotation
    • https://larebefol.weebly.com/uploads/1/3/4/6/134691273/6960637.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/basic_english_grammar_vocabulary.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/jupilososudojibijut.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/3577923.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/poema_atrahasis.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/739d0c4.pdfIn PDF document text
    • https://rosaguvedofim.weebly.com/uploads/1/3/4/3/134352906/minajekefojexin.pdfIn PDF document text
    • https://zikowetaxubof.weebly.com/uploads/1/3/4/0/134012945/wotufukobaxudipewu.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/husqvarna_450_chainsaw_carburetor.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/06d767056.pdfIn PDF document text
    • http://lakuberik.mywebcommunity.org/17481631936.pdfIn PDF document text
    • https://degijidugaf.weebly.com/uploads/1/3/4/8/134886203/1160016.pdfIn PDF document text
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/nabirew.pdfIn PDF document text
    • http://waragofekoxexaz.sportsontheweb.net/vandana_shiva_livros.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/4593079477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/wobunel.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/glossary_of_linguistic_terms.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/85984149442.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/kalabhairava_ashtakam_lyrics_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d929fb59-a1a6-499a-8640-bdd6c8150478/90854413399.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/kefidamuriwapamad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b42dd20-840f-4cfa-8ab7-da361f25d048/the_only_ekg_book_you_ever_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc342f4-88fc-45d4-abb4-b70291c15254/what_is_another_word_for_these_days.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/cute_birds_images.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/1991137660.pdfIn PDF document text
    • http://somifisuvukibuk.onlinewebshop.net/89880622245.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 5448 bytes
SHA-256: 0d6e36b4dfdb9b1a67c66c5b8fb8b3b55d80089caaba6c83860a168dd41af50c
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 2644 bytes
SHA-256: ba9015971ca1b2b35be262cdef488df9ae6af7902381a406f93668c4bd731c03
font_03_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 11128 bytes
SHA-256: 0c3a0f69f574d34cf4cc9b94f7fce8d247750f311630479985ef7a9dcacfcb6b
font_04_sfnt_off00014fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE9 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1
font_05_sfnt_off0001648d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648D 6356 bytes
SHA-256: de8dca589e41a913b656921c82b5f51b7b4d203f3e5e428fe25d705225ad66d6