Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c26db54f7693453…

MALICIOUS

PDF

89.9 KB Created: 2020-11-16 16:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: be436dc7fba2b2bf4ba75d39f2d781e9 SHA-1: d6e5f41825b56e00390ac93c45e18464852e99a9 SHA-256: 0c26db54f76934531153b5aa9a1ae636f667bc3776365f67100b57004697d4ba
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically mentioning 'master machine learning algorithms', suggesting a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'SE_INVOICE_LURE' suggests a payment-related pretext. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffset.ru/strik?utm_term=master+machine+learning+algorithms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f88a34759362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fafd264e5cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fada3a473019.pdfIn PDF document text
    • https://nosadipopone.weebly.com/uploads/1/3/4/4/134470180/sesonaxofug.pdfIn PDF document text
    • https://kotugelofamoxu.weebly.com/uploads/1/3/4/4/134403640/dowejazuzuve_fapamar_bugomipadeder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_5f989a9744abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5fae46e54358a.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://s3.amazonaws.com/zikeko/bahubali_2_dj_songs_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33712ba6-700b-487e-a56e-2364ae8b6458/sojifuretebibikan.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/weguburarupokazorowelak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab7ba1c-654d-40ce-b8cd-ebdcbfd5edc6/palette_of_narmer_material.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/n64_emulation_wii_u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1083b6-6e13-4007-a4e0-95f480ee687b/60995135303.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/55297037247.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_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 5008 bytes
SHA-256: a629b70e6544ddfcb02f3d659bd3ffb831b883fe3f33a7c52c428e977e80380d
font_01_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 10316 bytes
SHA-256: e026864d2b80453463f31a0987b0a48feadd9ccee5e3ea70b7468496aac681bd
font_02_sfnt_off00014c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C51 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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