Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6b470d164f6f5e…

MALICIOUS

PDF

80.0 KB Created: 2021-03-18 10:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5f1c597f9722096c8628fa1df3556b46 SHA-1: 232718c0f50b3a683fb80f808ad5a9e4a08223af SHA-256: 1d6b470d164f6f5ea9752571b7f8b695862136dcad9768d68a7d4a0e2e8796b8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or SEO manipulation tactic, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://soxebez.ru/award?keyword=english+grammar+test+pdf+free+download PDF link annotation
    • http://vigufut.iblogger.org/expressing_opinions_esl_worksheet.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/biodiversit_marine.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/luzesazusanojodow.pdfIn PDF document text
    • https://kevibudoja.weebly.com/uploads/1/3/0/8/130814666/ee885b49b186.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/20d90a15661e43.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/nodebisusutipure.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/884485d272931.pdfIn PDF document text
    • https://kuxadituva.weebly.com/uploads/1/3/1/3/131380841/d070da361.pdfIn PDF document text
    • https://febodume.weebly.com/uploads/1/3/2/8/132815732/3b52609f2.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/vubopofegu.pdfIn PDF document text
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/47bcc2ea7c.pdfIn PDF document text
    • https://duzozerijadid.weebly.com/uploads/1/3/4/4/134493401/totepemuninaful_fakuwuguwiketen_vajimugodisazij_sadorixufesotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biranon.rf.gd/taco_bell_shredded_chicken_taco_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/retalo.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/xufaboxepalepajigadow.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/how_to_trade_price_action_futures.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/73230557944.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/voges.pdfIn PDF document text
    • http://ludakijawiku.rf.gd/definition_du_cloud_computing.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/oregon_dmv_crash_report_request.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/dedonibudizen.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/rice_bran_solvent_extraction_plant_project_report.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 5504 bytes
SHA-256: 5dd92d9123c31a6ed3a55dd5b3758d4fe6537b0f8f9cbd5a1579f88d1322a2fe
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 11064 bytes
SHA-256: f7cf409ca6608310604040096ef68da78a43f6fa9161a596b1d51dfdb7eff4cb
font_02_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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