Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d9e80dcd283978…

MALICIOUS

PDF

85.2 KB Created: 2020-12-23 10:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8e48c45b4898574115081c202f13c552 SHA-1: c26cc144125ebe613c7eea08c296c9daaba7ab1f SHA-256: 79d9e80dcd28397855b293fe3387b800acab80b3b9f34561f2e04047abf9fed3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to distribute malicious content or redirect users. The primary URL, 'https://trafffe.ru/strik?utm_term=blockchain+wallet+address+list', indicates a phishing or scam attempt related to cryptocurrency wallets. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=blockchain+wallet+address+list PDF link annotation
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/622ff218d14.pdfIn PDF document text
    • https://gufurokis.weebly.com/uploads/1/3/1/4/131453316/binamevapu.pdfIn PDF document text
    • https://kutepazibug.weebly.com/uploads/1/3/4/4/134477769/mujufad_fumesexufoj_fajivotapexaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_5fbab387b6ef0.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/towiwul.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/rewomonasuguluk-vigopokumifur-zenukawulexus-pujelovaxaxa.pdfIn PDF document text
    • https://mesubepivugegej.weebly.com/uploads/1/3/2/6/132682347/8955521.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/nezezimisorowof.pdfIn PDF document text
    • https://rubebipanisoju.weebly.com/uploads/1/3/4/7/134735256/xunebiwole.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/pirofopafu/rovunegefabejek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5db779955c744b55d5a92/t/5fd65e2ce5ac5828962189b7/1607884336092/51621658951.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1576327a199023ab86c6c/t/5fc400337acac6192a3cd020/1606680629189/cordis_placement_steps.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59cd3bd14ff0dd2bcaadb/t/5fd72618034a586a4f5ce163/1607935515435/fafirivax.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_off00010ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 5232 bytes
SHA-256: 5291028c54f492362ba351ad86e8b344596b0313f05a5700d8d5612f35bff9b8
font_01_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 11584 bytes
SHA-256: 478d8cbdbc370721abb19d3238ab9b8f50e622e9c3928d98fb000235b168f1d6

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