Malicious PDF — malware analysis report

Static analysis result for SHA-256 3999351bc6275406…

MALICIOUS

PDF

88.5 KB Created: 2021-02-16 06:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bc40441171dbbb56a33a8df8eb96dd7c SHA-1: 66b9841a5df2d9a7c973d0c2a9dd6226972dd48d SHA-256: 3999351bc6275406988454b8e2838eaf8962868c2e55eba5bcba30b86ce19261
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files and a primary URL likely used for SEO spam or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/wix?keyword=abo+blood+typing+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386613/normal_60249f18e1507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_60196d6a98a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_6029540b77be2.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/6445363.pdfIn PDF document text
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/2137266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5fe981d06d756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_5fff78a49d68e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_600b300b9c795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5fe6f0aaa2976.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5fcfe47865ad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fc9cd1687183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fdc45f1a3263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414851/normal_600870313755e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_602afae5599c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fceb5f18fd9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/banula/catalytic_naphtha_reforming_revised_and_expanded.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/javobowurenawutoxexi.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/4114128585.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/zemixidebekorelixumonug.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 5240 bytes
SHA-256: 616a23ae4e6aeacfc2b6da9c36ce1d5afd1eff4b98a9490234b088e5f3340cbc
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 6784 bytes
SHA-256: fedb2f189c8480caff3900ca2f65861ced9dc6f650a3cc8a6f896dc1a923fdab
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 9992 bytes
SHA-256: bdd1fbbc34e6338f28496b501fa0b7b9c900b67a7a891a257340475614999e26
font_03_sfnt_off000145fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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