Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36c4ec4fe6cafdc…

MALICIOUS

PDF

81.8 KB Created: 2020-11-24 13:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4f11ab9db5900b356b4af1f4bac1ea4f SHA-1: 109df833f866e4324e0552ef397a11667e4ee521 SHA-256: b36c4ec4fe6cafdc406803fd133076dbacbc2174d9f69bcc5c78b0fac3fac137
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=carbon+fiber+material+properties PDF link annotation
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/bakeloti_tuworonovof_lezafawov.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/47de143969989c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_5fb38d2f231a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f95373a85535.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/a7b88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5fba1b7c0f487.pdfIn PDF document text
    • https://gazisaki.weebly.com/uploads/1/3/4/3/134371182/pifaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f9c3a4cec836.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
    • https://uploads.strikinglycdn.com/files/16585793-d4fc-49d7-92ff-07e975ff21de/niwetawux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22551cc8-1bbf-4840-a54b-09782aa8f7db/viputuzofopomufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046a1b78-757a-4559-99f5-044fd3c9f87f/dedixixivekimekefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f396e29-e84e-4d09-b450-18f5008e1408/bobcat_743_skid_steer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841afe50-aab0-4765-a413-7a8c15ca218c/wosikeriliwuzizufexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09b53bd-3e45-44a2-b6cc-47a0f605330a/22252622939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0084e95-3204-4836-88e6-024de2a92e70/army_executive_officer_guide.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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 5000 bytes
SHA-256: 98852ac417f33cc14ab2afa10e976e7041f0a14a2a0135fe23fb249eefce0069
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 11944 bytes
SHA-256: 922ee729519ddac005f6ea746a6ea8d2d6bddc89263c8426e2deddcca7776921
font_02_sfnt_off00012a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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