Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32132a5b4876042…

MALICIOUS

PDF

116.3 KB Created: 2021-01-25 21:35:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cdf1db816b2f537b1b80693c0bf617f4 SHA-1: c06791e2c53ed46865c4d5a25e3bd0a6cbcac5eb SHA-256: e32132a5b4876042e5684b6c299109ac7c4c666a378b5e3008cb65be724620dd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely to redirect users to phishing sites or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=west+haven+train+station+to+yankee+stadium PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393624/normal_5fcdaebbdb588.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/320597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fdecdd1e6b77.pdfIn PDF document text
    • http://susurrus.space/hatchimals_colleggtibles_season_4_waterfall0qpi8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fd76b08e9c9e.pdfIn PDF document text
    • https://cdn.sqhk.co/fenajobuwer/dPggtbA/esrs_policy_manager.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/gcjaegi/zipusemozavimodolujena.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/hjzichg/39732503476.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/90dd2c23.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/deremawodarebop_gegabekenorida_solebilasupati_bokewetu.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/a36f009de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5fd8690a9b89b.pdfIn PDF document text
    • https://malosopiwa.weebly.com/uploads/1/3/2/6/132695478/ninebemobajo_lekewevil_siroj_pavetamolamin.pdfIn PDF document text
    • https://vupolape.weebly.com/uploads/1/3/4/7/134749420/7b19d967.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_off00017da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA2 5272 bytes
SHA-256: eef8acd1125e531f49c521d3f8f9ce435c4d31d7bf850e1266a9067ef2abfe94
font_01_sfnt_off00018f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F76 16832 bytes
SHA-256: f34b4e01ee25be097c85fbae96031bb664b755c9c4122c8a2a793e8ed1ae5bc4

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