Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8cf5e4ac70bf94…

MALICIOUS

PDF

85.9 KB Created: 2021-05-13 04:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ba0e157d8efbf5d5cbe1e5fb62f6a88a SHA-1: c984c40af2ca48b0c39e19bd12a6869ed8c0a3d5 SHA-256: 6a8cf5e4ac70bf94aa79e976a7cdfe37dd443fcac6b9d3384dacf709a0205f27
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=avaya+phone+18d-0003 PDF link annotation
    • http://jelelegukawox.22web.org/best_charles_bukowski_books.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/ggbMYpS/open_world_survival_roguelike.pdfIn PDF document text
    • http://theharaka.online/how_to_figure_out_mixing_ratiosl8pw1.pdfIn PDF document text
    • http://get3creditscores.info/jbl_flip_3_portable_bluetooth_speaker_specifications8p1mz.pdfIn PDF document text
    • http://dreabling.online/60237129522qid3b.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/hjagiIS/carters_hooded_dinosaur_jumpsuit.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/hQ2OhcQ/93529957714.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/uihogeZ/pifonudapijowa.pdfIn PDF document text
    • https://turamidiwirak.weebly.com/uploads/1/3/4/3/134340523/86e4f5a.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/3040702.pdfIn PDF document text
    • https://dazenesulamese.weebly.com/uploads/1/3/1/1/131164173/924104.pdfIn PDF document text
    • http://nazhivy.net/nextbook_10.1_2-in-1_detachable_tablet_pcql10j.pdfIn PDF document text
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/695027.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/harggOC/monster_trucks_movie_toys.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/popilo/92604686497.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/taco_bell_menu_20201.pdfIn PDF document text
    • http://wugulinutefi.rf.gd/acta_constitutiva_de_una_sociedad_cooperativa_mexicana.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/petowawufi.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://www.gnu.org/licenses/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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000efa6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEFA6 10448 bytes
SHA-256: bea0b180a5b631423ea86f2d97dd3d81f711fddf0a1ae60922c944b393129ab0
font_00_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 5476 bytes
SHA-256: 01fd63219ec882ca0dc2a87d88a27d324ee989fa2f40a7e2a4e671d2d4e18229
font_02_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 10812 bytes
SHA-256: 51f1f0e96452a0fcf5f4d369b9167036198a4fb175f2d875ba090e3949451ce8
font_03_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e