Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ce54181616170a…

MALICIOUS

PDF

66.9 KB Created: 2020-11-26 07:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 224a3b33ac5e0e9aa1f54e3149f53726 SHA-1: 59a876a4cb52da9852179ceb2302d75fe353c99c SHA-256: 56ce54181616170a7d415cc84f5e0f1ffda77fda6bf2b9a38daad98fe1e558a4
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm designed to distribute malicious content, with one of the linked URLs being https://trafffi.ru/123?utm_term=kent%2527s+mechanical+engineers+handbook+pdf. The document body, though heavily obfuscated, appears to reference 'Kent's mechanical engineers handbook pdf', a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=kent%2527s+mechanical+engineers+handbook+pdf
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5f9e0f6166801.pdf
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f9695dc5ff30.pdf
    • https://xumuxurubaxuk.weebly.com/uploads/1/3/4/5/134501003/7504220.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f96f37c12a84.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f971b2b86685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9eda350e-24d3-40c2-9f1a-46e3b6c0c639/wuxeke.pdf
    • https://s3.amazonaws.com/votawawo/freebsd_usr_src.pdf
    • https://uploads.strikinglycdn.com/files/58fd4b8d-a41a-4c59-9c7c-5387c91caa6d/zimusosozokexitodutedil.pdf
    • https://uploads.strikinglycdn.com/files/b338d8ce-6ed2-4af8-a9d6-50547a8422f5/pisogosesamasegisov.pdf
    • https://uploads.strikinglycdn.com/files/2e806b9d-8b90-4eed-bf87-6e62a675ecec/zosujasos.pdf
    • https://uploads.strikinglycdn.com/files/8ea4d6a0-a120-4a62-9f1a-f0a4d49a4322/97728052935.pdf
    • https://s3.amazonaws.com/zupenafud/84426666908.pdf
    • https://uploads.strikinglycdn.com/files/b7b515cd-370c-4e32-8a12-51421a6f52f7/64140843814.pdf
    • https://uploads.strikinglycdn.com/files/5adfa05b-5e0a-43fa-a9e2-dcd4616eba03/kenwood_mc_60_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4cb.bin
99f331f9b94fdaa7e27c3b95a94d6263121d25d7be47790724ab536e2a79742f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 5776 bytes
font_01_sfnt_off0000d848.bin
a620688a205742af5a3014e2523d62d893bc95b05fc42095fe464f2283ad1c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 11112 bytes

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