Malicious PDF — malware analysis report

Static analysis result for SHA-256 440870d329638a10…

MALICIOUS

PDF

77.0 KB Created: 2020-11-20 08:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 253462d5c14cd65c7a1822270a872fc9 SHA-1: 9dae8548de815bc6ff906e053dfa24f79d63ab59 SHA-256: 440870d329638a10b7c000d765145c1244724fc50bd6aba548798402a8788f7e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=ihome+portable+charger+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f8a4fcbcb7e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f93ec52459fb.pdfIn PDF document text
    • https://wijisozafepu.weebly.com/uploads/1/3/4/3/134356417/mupogaji-butonukimukab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f8b572b816fd.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/3698296.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64318be8-cf75-4aeb-ba72-d357dde6e6f9/xalelijuzadirivogi.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/catalogo_botas_price_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60634b01-a872-4a23-92bf-c1b7cd210166/9896235994.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/lofunikozidemiw.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/wumokofirebaluw.pdfIn PDF document text
    • https://s3.amazonaws.com/kozikixoju/tinapang_bangus_recipe_from_panlasang_pinoy.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/simple_past_and_present_perfect_quiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 5244 bytes
SHA-256: fa6e9afdfee291fc6cc7cea9dbf8bbb2aef68aa58dc30bf540190b11837d9342
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 10856 bytes
SHA-256: 04f8fe9e51e5e148f6691a8a9974f26c782609d31558c8c282642c1f8147f5c5