Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f3bcf4fea58fa5…

MALICIOUS

PDF

64.4 KB Created: 2021-02-08 05:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c9f5212f5c89aea0e25ed3611328bc41 SHA-1: 89613f5c9208922e82a9cafe59062bdf9b281dc4 SHA-256: e3f3bcf4fea58fa502024804dd208dbd255a8c852f7b97092bfdaf7a16516a7d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDFs, likely to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is part of a phishing or spam campaign, with the primary goal of driving traffic 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.
  • 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://jottigo.ru/wb?keyword=linkin%20park%20carousel%20song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5ffd63a739297.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/5650670.pdfIn PDF document text
    • https://kowexemi.weebly.com/uploads/1/3/1/8/131872048/jijitomafinegilafov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_601f996ecebc9.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/ifFOjb1/foxovegudevalenose.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/hdajbau/14273096798.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/papiguziwasiro.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/USqhfig/ninukari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5fc78e1f0d00e.pdfIn PDF document text
    • https://vuveporejar.weebly.com/uploads/1/3/2/6/132695394/fugawumexurerepobad.pdfIn PDF document text
    • https://xilinupuvawede.weebly.com/uploads/1/3/5/3/135350476/viluwivizoj_besoleli_nezum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raxusitusumulag.rf.gd/layering_technique_in_anterior_composite_restorations.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_off0000c0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C4 5108 bytes
SHA-256: 7678f2b7a60dece01a5397af6a35de1903f23b9b0a9669e46c6b5c874b6b27b3
font_01_sfnt_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 10304 bytes
SHA-256: c3c6973a114bdbff05d411e03dd8ca03592783c52c0e5ee0713d3c72a18806bf

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