Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f01030487872635…

MALICIOUS

PDF

67.7 KB Created: 2021-02-12 23:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 11615fdd1b4fd11a9cd06f0143bef941 SHA-1: b61ed6c570d25232743a1c95bced909ad0671899 SHA-256: 4f01030487872635fe78e83d1a8f884c5a4ce9ae785a8fd6e5d968367ae366cd
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=minding+my+business+in+spanish PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fe15193cb52b.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/pdf_tambaoga_mwanangus734q.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/92175d941debbd.pdfIn PDF document text
    • http://storezone.info/7273379094008792.pdfIn PDF document text
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/duzujaroze_wikubu_kevufomitudoriz.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/bihidTh/rojasefosa.pdfIn PDF document text
    • http://ceter.xyz/raxere4s50m.pdfIn PDF document text
    • http://italy-small.space/mobile_strike_beginner_guideiy0yr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fcf81513e3fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fd062f817252.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/pichehi/fiwetabivaluponojed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 5492 bytes
SHA-256: 73e26f4ac3e9952779504ba0c88d8225da1ecc469fbbf6632edb822523d75c2e
font_01_sfnt_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 10960 bytes
SHA-256: 5ef84000ed6f09055aba91f1a115b2e0f1556d10f7d76b646f185ac42ff29013

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