Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdec6f6932f82c5…

MALICIOUS

PDF

74.9 KB Created: 2020-11-29 18:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4b203c481b565e75d7b1d86dae1870bb SHA-1: 22703bed9962989332a6094e2e0230e2de8d554e SHA-256: cfdec6f6932f82c5518cfa45319c16e07105c386a1b1bc861e96fd66987c0a49
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links. The ML classifier also assigned a high probability of maliciousness. One of the primary external links identified is 'https://trafffi.ru/strik?utm_term=the+raven+king+themes', which is likely part of a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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/strik?utm_term=the+raven+king+themes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494677/normal_5fadec6e3011a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5f99fb9a8253b.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/budisuxex-zilafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/653e81d3-13c3-4f09-9865-cc6ccfde3656/dnevniki_vampira_lostfilm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858a21c7-b7ca-4459-b129-4d6b1130bcf7/bill_hodges_trilogy_reading_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f37af1-6ba6-4afc-a96b-d903c4023027/ttm_meaning_slang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073357aa-c977-4fea-903a-b1c366f49960/xizizeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1196a8f-9eaf-4504-be06-3b5abe88121c/duvat.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/sawazetazurarojojokadip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b029a4f4-6548-4742-af14-70235cf4ad4b/83755088375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c1ed21-aa5e-40b3-8461-6d55c8308686/wobumideninusamuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d292bb9-df56-4e2f-b7b0-07569ea50ce4/89291857095.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_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 5140 bytes
SHA-256: 5e5ee041b1a23c53dd4fca8baa3316139391a411bf0a7f249e761a8b0dc9f7fe
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 10456 bytes
SHA-256: 5ba5a45fd208da01d166289739712cdca37ddcb0bc5e23967855790e9c714bf4

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