Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62f9728dbf5becb…

MALICIOUS

PDF

73.8 KB Created: 2021-02-21 17:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 97cb86652f6b664891f6d807b7997afd SHA-1: 5b04abaefaf233957a159f92ee55ee59bc9c9bb4 SHA-256: e62f9728dbf5becb7ad8fea62905d48ee7963b65aa031d5d2780980f9bc9c697
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO spam or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

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.
  • 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://druttle.ru/strik?utm_term=craftsman+platinum+7.25+190cc+oil+drain+plug PDF link annotation
    • http://citruss.space/cccam_plugin_openatv9bnwb.pdfIn PDF document text
    • https://tofeligekejogen.weebly.com/uploads/1/3/4/8/134873344/vavunuriru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_600b9e5fdeed8.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/bgcXfDt/bottle_flip_bottle_jump_3d_download.pdfIn PDF document text
    • https://pinabufibofux.weebly.com/uploads/1/3/2/6/132682338/8707839.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/031f4948389c9.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/futomeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_602c679cba784.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/zadutusejemuxoj_biloburepunuxem_duduxowew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_5fd881dbf3df3.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/3bf8e6ce4283e.pdfIn PDF document text
    • https://kofiwesufe.weebly.com/uploads/1/3/4/7/134748014/8494d048e1e.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/zisulamisozoto/failure_of_bolted_joints.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/firefox_60._5._2_esr.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/13716351291.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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 6100 bytes
SHA-256: 63d1dd7be1225667d4cc9679ffc01ff42cf71b5dd28d5eb8dcc9a38b3eafea25
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 10816 bytes
SHA-256: 45191f87076c005f1c52c4799af56748ab083df382c6b1bc2de9d95a1aeb98a2

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