Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b824b1b2848778d…

MALICIOUS

PDF

73.5 KB Created: 2021-03-14 06:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4680586d23118718a7c87aca11cdd66e SHA-1: 20e8628f40ab6311f162402eafbfad51f99fe950 SHA-256: 4b824b1b2848778dfd3a9bae088cab3aaa4bd90c8c31b99debd15eca6c8b0e7d
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable domains, characteristic of a link farm or SEO spam operation. The presence of URLs like 'https://xezojetit.ru/strik' suggests a potential phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/strik?utm_term=nixon+sentry+38+rose+gold PDF link annotation
    • http://kobazugipodiv.medianewsonline.com/bridgman_drawing_from_life.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/dell_active_pen_pn556w_tip_replacement.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_be_interior_designer_without_degree.pdfIn PDF document text
    • http://xuxuvojetuzutej.iblogger.org/pufuwimekun.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/how_to_find_income_summary_accounting.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/foturuxegarivoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9bd917b5-9ded-46c4-bf3d-b93d94266aff/les_miserables_musical_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c2f9c8-7f08-4172-968e-ffad81fc451e/animal_farm_book_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e19f80-dec3-46aa-8655-010d75581bfe/51547275064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd92926-0948-476e-bff5-af654a85bc56/rusewuranimiligogixote.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_2eb04c35d61f4d3bbabd6b05691d04c1.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7e30d87766654e05bb213f9adf69aaa0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0462011-76b5-4900-9f99-cec6dbc0fe5c/46029919037.pdfIn PDF document text
    • http://todakule.rf.gd/44153550305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203f0227-13ce-4c92-9da1-5d9393b3f2e2/favuratagu.pdfIn PDF document text
    • http://gevitejivojo.rf.gd/button_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e69f324-191e-4dae-95c7-f07f4ef159c8/hp_officejet_6830_printer_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa9c937-5d96-4347-996f-214b209324ee/canto_catolico_saber_que_vendras_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac28fe43-b34f-46a6-8297-5cb37c78448d/molanumununokebode.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_516d52779cdb4b1ba896f51b723185ed.pdf?index=trueIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/why_didnt_tom_bombadil_take_the_ring_to_mordor.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD297 5068 bytes
SHA-256: b0c7dc4ea0e3d0f54ce6c9be5760906a4378283db0d16996427b2095304653c7
font_01_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 10796 bytes
SHA-256: 42015b3f2cbfd3bdd8beeb1fc13e494f5eed079dda3e422bca8b423c6c4070f8
font_02_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34