Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1342c796d3418c…

MALICIOUS

PDF

65.2 KB Created: 2021-01-11 03:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ac2fcfc7875e145d32f58c01e933fa2d SHA-1: 714d51ed12c0709119e3b6ce7cce0910317817ff SHA-256: 6e1342c796d3418c7ab7d3c0acc63444d63752aa93fdc31d39c2076ab71b70ec
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body contains obfuscated text and metadata, likely to evade detection and disguise the malicious intent of the embedded links.

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.
  • 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://traffset.ru/123?utm_term=the+alvin+show+working+on+the+railroad PDF link annotation
    • https://mupipuko.weebly.com/uploads/1/3/4/3/134370635/f19feec007bbb8.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/BKHVgdV/zamibezijapafabogage.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/ohadoge/blood_glory_mod_apk_data.pdfIn PDF document text
    • https://foxaxefaga.weebly.com/uploads/1/3/1/3/131398491/2348824.pdfIn PDF document text
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/rejofafino_roresuxij_babap.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/7a5331d0516ca.pdfIn PDF document text
    • https://xumulevaz.weebly.com/uploads/1/3/5/3/135348617/767ae70089163f.pdfIn PDF document text
    • https://site-1174183.mozfiles.com/files/1174183/58255314752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fe4884830b24.pdfIn PDF document text
    • https://bekozowa.weebly.com/uploads/1/3/4/7/134713297/d4207f75.pdfIn PDF document text
    • https://mupaxeruzu.weebly.com/uploads/1/3/4/5/134597089/kukumazaxurelef-bozavazirax.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/5563376.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
    • 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_off0000b4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EB 5040 bytes
SHA-256: c33a9b333261ec8d4204e1a561e246f40e11d644211f48442c0307e08357392a
font_01_sfnt_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 10516 bytes
SHA-256: 01cf4c50b904f2e26f210e0a00e827383967b90ebcff7754f5fbaaaa49f1a4dd
font_02_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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