Malicious PDF — malware analysis report

Static analysis result for SHA-256 b751328a5efbd9be…

MALICIOUS

PDF

67.4 KB Created: 2020-11-23 18:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aaef9b4a935d0ac41b9ebb12ebc9a986 SHA-1: 9c296a65fe99997d95e222208761b43d924152f1 SHA-256: b751328a5efbd9be8ad1faac5bb12ca91fc659b1e7c736149163e727f7e81078
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=cummins+generator+service+manual+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5fb2cc7bde2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5f8d19cf91d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f87f4402c06c.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/0075e55c0a8.pdfIn PDF document text
    • https://nezijolumuka.weebly.com/uploads/1/3/4/0/134016970/f45736e0f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5f9ea2e026d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fb49a7509bca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/795b57a8-c5ed-42a4-90ba-c35bef623640/fifodemuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebbdf84-819e-4b37-9663-2e2dae70887b/download_minecraft_unblocked_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7237f709-073a-4ccc-9a3c-ae5c4ecc105b/the_borrowers_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f6c2db-7eb2-4278-b1d6-384150ee3139/story_elements_worksheet.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_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 5400 bytes
SHA-256: bf47ae216c3058b3a1d074c94ecce9c6074a01517e573c5139615bcd184fbff0
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 9908 bytes
SHA-256: 01441a4d6245833d188872d12888ff77f4cb9e949683b23e7052cefdb8ccfd1c

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