Malicious PDF — malware analysis report

Static analysis result for SHA-256 278c7b47dd32e315…

MALICIOUS

PDF

79.9 KB Created: 2021-03-27 14:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 28c7445fc4d2ac5785c8a13c55c0eee5 SHA-1: 9cd77b374267195e184b139107413a30396d37d5 SHA-256: 278c7b47dd32e3157443419f9126d5009494ba98cd2ba7e5269976b2485167c6
226 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, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external URIs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/award?keyword=oracle+autonomous+database+cloud+pdf PDF link annotation
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/deberikeparanira.pdfIn PDF document text
    • http://wiwurike.iblogger.org/nonketotic_hyperosmolar_coma_treatment_guidelines.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/9322630.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/xatidakebafose-teraj.pdfIn PDF document text
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/fazamujajevuxurez.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/Zd6hIjc/xitaxepi.pdfIn PDF document text
    • https://cdn.sqhk.co/tapowifilez/jjijigh/meet_usa_chat_and_meet_friends_apk.pdfIn PDF document text
    • http://xapunubezes.iblogger.org/scrum_methodology_tutorial_for_beginners.pdfIn PDF document text
    • https://lovuvolix.weebly.com/uploads/1/3/4/8/134866108/pafowejeropibot.pdfIn PDF document text
    • https://wozijosetat.weebly.com/uploads/1/3/1/4/131407158/kerojifame_xujamexenuxi_jazurikujagumaz_luralubareret.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/ic1nphc/fedivusoxox.pdfIn PDF document text
    • https://cdn.sqhk.co/zoravuzulop/tsgesNJ/sifafolutowi.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/mumezogejuwig.pdfIn PDF document text
    • https://xewuligatojijow.weebly.com/uploads/1/3/5/3/135395235/005acf5c100.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/igxACJe/how_to_bake_pork_chops_in_toaster_oven.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/fUGhiZB/wenoweliwide.pdfIn PDF document text
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/fb0b74221dea6.pdfIn PDF document text
    • http://debakabuxaw.22web.org/30550920713.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/vigaz.pdfIn PDF document text
    • https://titenukom.weebly.com/uploads/1/3/4/5/134523185/lasuwopegosat.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/fge9hiF/12800365372.pdfIn PDF document text
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/657b6ef5a1f.pdfIn PDF document text
    • https://visumosibe.weebly.com/uploads/1/3/0/8/130814065/gesak.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/ijNGLbX/minecraft_pocket_edition_gamertag.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
    • http://baxisewigetas.epizy.com/romurebenozazibukiwop.pdfIn PDF document text
    • http://lajexexetawibo.rf.gd/registration_form_template_free_in_asp._net.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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 5304 bytes
SHA-256: c7434411fbe71ca1d7fc855e0329b76d35d49a54d6e5893f19aa15e7e31f8ebc
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 10484 bytes
SHA-256: 7cad77027c6360c0b3bcc9d3f948cad882f10e86b110f5416f75c746f8acdd1c
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34