Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf5af28d0cefae7…

MALICIOUS

PDF

69.8 KB Created: 2020-11-18 13:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8b1e9e1453c6f10e2f7ba19d08cde1a7 SHA-1: 124a1b7629956d346a2eeb533100cc6cbffc21a1 SHA-256: bdf5af28d0cefae765ba94c9e9a629617dd2f412eb481f3a6f3d5f5be92223ae
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/aws?utm_term=adobe+premiere+tutorial++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5f9452f332781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_5fa7223b0f14e.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/lipol.pdfIn PDF document text
    • https://wowutelugige.weebly.com/uploads/1/3/4/3/134359508/jaxumuduwifabef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5f963fade6314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fa059a2b3624.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/3954647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fa0701b5f799.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/e8403f58-eb7e-47ec-b8a1-a409d84233bb/gofulogegatedutabej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3829edbc-4a7c-4859-9e8e-bc71d23df362/37476014991.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/why_did_the_footpath_killer_stutter_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a292aba2-9220-4c75-8a8d-002d04398fc3/90866668123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd97bbc-a995-493e-93f3-afab0b83459d/69541308922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04fb902-059f-4f86-b3bd-e32409ac89fc/super_mario_all_stars_with_super_mar.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_off0000ca53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 5140 bytes
SHA-256: 62a96803c7d84557e4ede22c46cb31379e03ab841f0d01028e6c329566192016
font_02_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10612 bytes
SHA-256: 6e0b651fba513b03c94d86ad3c82b9b835ec25cee09849598f2870eb4b5d3196

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