Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fafe38a762b30b…

MALICIOUS

PDF

80.8 KB Created: 2021-02-21 02:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f408436757032316de697bd61db314e5 SHA-1: 8ba32c32351576c4be11910644008ae47d27f890 SHA-256: b6fafe38a762b30bec683aa16722d975e5a14c2af08bb035db2158bcb7f35cdb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to redirect the user to malicious content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=how+to+clean+drain+filter+samsung+washing+machine PDF link annotation
    • https://cdn.sqhk.co/luwibajik/gdjjjiw/kinafavowumazaj.pdfIn PDF document text
    • http://wopebexe.66ghz.com/luton_guided_busway_timetable.pdfIn PDF document text
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/zapas.pdfIn PDF document text
    • https://cdn.sqhk.co/lebexuzo/jwFWzEw/barber_shop_nyc_open_late.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/yvifghZ/julotov.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/cic3Tgg/parking_night_motorhome_campervans_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_602597b00f6c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_6029f6ddd2e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_6013a3ddb20a7.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/hfqrjec/wixisojeze.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/88615e9d.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
    • http://lozebaloporan.epizy.com/partnership_agreement_format_in_sri_lanka.pdfIn PDF document text
    • http://girupesoja.rf.gd/nijusokudobilaf.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_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 5372 bytes
SHA-256: 6567159a31ca551badff53336c4013d37f799f604a9366101b15787d89854035
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 10272 bytes
SHA-256: 809d790f7817d16c00181d6d73263a7f8992bbf31b4239ea03ca05b1c8024e27
font_02_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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