Malicious PDF — malware analysis report

Static analysis result for SHA-256 471b6ca315de03f6…

MALICIOUS

PDF

66.1 KB Created: 2021-02-01 03:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d31a6ad43eacc723d9ed7cc73134acb9 SHA-1: ba0e2df57805b6a16a7d8804c2f6fe6075955ee0 SHA-256: 471b6ca315de03f6c179ee55d280c5faff7647c8df1a8b5cec3b33bb656a446c
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=mt+pleasant+waterworks+contact PDF link annotation
    • http://trokot-roznica.xyz/wedorafrffs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5fd156a2a9cba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fc977d4f224c.pdfIn PDF document text
    • http://roskycnmx.com/jerizibamobal3cij.pdfIn PDF document text
    • http://flipping-car.online/kenukofefok9pv8g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_60100bbc18fda.pdfIn PDF document text
    • http://bonusiotsbera.online/tinefududegodixonimelodof5prhb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5fd8dffe67d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5fd9110a24969.pdfIn PDF document text
    • http://dektesheff.xyz/93707592589xgz1i.pdfIn PDF document text
    • http://heartcenteredequestrian.com/184327461996y1jv.pdfIn PDF document text
    • http://phrensy.co/adverb_intensifiers_worksheet4f8o0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxumejaxumem.epizy.com/23929256693.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/47903651457.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/emathinstruction_algebra_1_homework_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/zerafaz.pdfIn PDF document text
    • http://jupilabezisetif.epizy.com/7194290849.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_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 5088 bytes
SHA-256: eeab89ce8186c3fbdc6aaac440c738dc72d21a6581c72c0f4147aebb25410c11
font_01_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 10284 bytes
SHA-256: 9c144decdcc0ea1bd7b35e7a179c2b26a1a6e083eb41558851e069ecf85f9f28

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