Malicious PDF — malware analysis report

Static analysis result for SHA-256 539e5fa6cf077e54…

MALICIOUS

PDF

69.4 KB Created: 2020-11-11 09:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a7981ae7fd29789866017d992efebb56 SHA-1: d87b32338c5501d7bb829f7c2b966d3bc3ae4448 SHA-256: 539e5fa6cf077e540bb46af2c19f962616e37b1ebab42d23fe17e1d9cdffa673
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://traffnew.ru/123?keyword=the+amazing+spider+man+2+games+free+to+play PDF link annotation
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/8585144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f970ead7a758.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8701505ec19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5f9d3e1f41280.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.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/5e6306f2-a452-454a-83e4-40855fae370a/craftsman_lt_1500_transmission_drive_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/74876455132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd45baa6-cb56-428d-9c89-8a4164404c82/35360215859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d99a0a-57f3-47b8-aca8-721dbd6da609/90476819995.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/hulu_activate_device_activation_code_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c843888b-2d3f-468d-9d30-5dc84db3cbfa/duzobewufunirejubape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9812e9f-2d64-4e64-a521-0c4b412e896e/21572928148.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_off0000c44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 5476 bytes
SHA-256: e38edd5c84ede4103f3c0143d8e541d189c9d9a10f80e9c7a307bf7e9a5ab728
font_01_sfnt_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 10536 bytes
SHA-256: f6913ab8fe955221b7920892f1278eeefd54fe227c05d493e393a21992b1da79
font_02_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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