Malicious PDF — malware analysis report

Static analysis result for SHA-256 d660b5052156e728…

MALICIOUS

PDF

108.7 KB Created: 2020-11-25 00:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cae2746535990c26a02c49de2acdcb89 SHA-1: e4843d6f43ef69c2ed02fca7f05cdcf835d164dc SHA-256: d660b5052156e728c6f4d3076b6acafcd26448d10c29657ce120472a359b0426
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of external URIs and the overall structure point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/aws?utm_term=xbox+360+backwards+compatibility PDF link annotation
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_5f8cf26d1a2f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5fad6d17dc46a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f8d332734000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_5fae67ac5e2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_5f9f1bca6520e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f9c399f40d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5f8e4b993a64e.pdfIn PDF document text
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/dd4949b9e95b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5f8f45569cea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5fb288134b6f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuniku/lijunaparewerazag.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/92761883892.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/korojufuzodot.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/poxaputiparadegab.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_off000169e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E4 6124 bytes
SHA-256: 610c28a49d32e3ce1b20f9fe8c920122185a6ca289cba66317b792f9e3da5a4a
font_01_sfnt_off00017eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EB2 11500 bytes
SHA-256: 0336d672bb73d1747c9cb1d352ac612e096b6f61c27539f4e4be67359ef7af19

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