Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6730fc20793276…

MALICIOUS

PDF

75.4 KB Created: 2021-01-07 21:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 010bb989348066795128447402aaf7b5 SHA-1: ecf60a4c527c2882dd805f68f8bbe91661441f06 SHA-256: af6730fc2079327637d63abd1a9380254c4d09ebbf676a656aa5093d119c61b4
186 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to various external resources, likely for phishing or malware distribution. The presence of multiple external links, some hosted on disposable domains, and the ML classifier's high confidence score indicate a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign.

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://trafficel.ru/aws?utm_term=google+chrome+free++for+window+10 PDF link annotation
    • https://cdn.sqhk.co/wujukipako/lMgi2ks/fogik.pdfIn PDF document text
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/dowejosezasexeb_kerotidowazazez.pdfIn PDF document text
    • https://sarurudadolixo.weebly.com/uploads/1/3/4/6/134644817/7570963.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/cbBiZic/91629761712.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/ganoxumul-nufubawadolifi-zawabidi.pdfIn PDF document text
    • https://kabulemumolitu.weebly.com/uploads/1/3/4/8/134869515/wemifunutukon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5ff49f4e28f9e.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/ligomupotedetepoko.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/f8a7294f7fc054e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_5f994859afa70.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/lusegokaves/zewajugal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396b2c86-b719-4cd9-a5a3-b5083aac21e0/vuvutagexeruwato.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/angular_material_form_validation_minlength.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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 5364 bytes
SHA-256: 0e89735b331a4881c42263b178e4183da36c85e7c0815362d070fbdd8babcaaa
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 10412 bytes
SHA-256: 4af4d24163c0cc1bd4a7829bb041008bb0727bf793e8aedca6cec19c2ed4f6dd

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