Malicious PDF — malware analysis report

Static analysis result for SHA-256 93168977613e2b79…

MALICIOUS

PDF

77.8 KB Created: 2020-12-31 03:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d7888a4f31ff159789b39b1a251f97bf SHA-1: bbd8d03c8886ed65cf3fe022451b633d96c08ae5 SHA-256: 93168977613e2b79f861f34a072b64e3a993e254e69e63f9bcf3882661cfe201
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV. It functions as a link farm, containing numerous embedded URLs that point to external PDF documents hosted on various domains, some of which are flagged as disposable or suspicious. The primary URL leads to a known malicious redirector, suggesting a phishing or malware distribution 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=space+agency+mission+12 In PDF document text
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/7611586.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/7526178.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/Ohdjaha/70165211637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fa2debb60893.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/ruwuvuvefewero_sijoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_5fb34672d5812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f8f98511ba66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444644/normal_5fc64433b5182.pdfIn PDF document text
    • https://zamidagotef.weebly.com/uploads/1/3/1/4/131453459/7204508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_5fb92712f0384.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
    • https://s3.amazonaws.com/lejivugeleguwod/anthony_giddens_sosyoloji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d62877b-e8a5-46a8-a4cd-1098f869a942/31828963918.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 5224 bytes
SHA-256: dc72efbd8b0e822ea5a78ce7d220ea82995e8aafa76d5a954c823edd551a6663
font_01_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 11676 bytes
SHA-256: 1450f75c66523ebe899b58f0538be89f170f99599ae35f630bb3b88594ea0739
font_02_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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