Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b745d805ebb8cb…

MALICIOUS

PDF

75.1 KB Created: 2021-01-03 02:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 227de697738321d83a7b9369d8b25a8c SHA-1: ec4937c4ca7880b6e4c9b6eb2fd95ca3cfee0060 SHA-256: 86b745d805ebb8cb10bbd20d42461d84a0ad3a4b973504d8d8e02dc30b69bdf4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, specifically identified as a 'PDF_SEO_LINK_FARM', suggests the document's primary purpose is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure itself facilitated the embedding of these external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=atkins+pdf+carb+counter
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/20279c04647610.pdf
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fdd317736830.pdf
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/babijujov.pdf
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f918abab738c.pdf
    • https://judetali.weebly.com/uploads/1/3/4/7/134723341/5773716.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5f9256e52ac8d.pdf
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5fe70ee9583ef.pdf
    • https://cdn-cms.f-static.net/uploads/4417403/normal_5fb6d1a9e7638.pdf
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/867718288.pdf
    • https://cdn.sqhk.co/bitubebo/2EOhOhf/lonovesidupufo.pdf
    • https://cdn-cms.f-static.net/uploads/4393900/normal_5f8ff2ec13ed6.pdf
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fd1b05d8bb14.pdf
    • https://cdn.sqhk.co/kabevapixox/jdXEig3/66272239262.pdf
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/kerixumisizolew-pivadomafe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8a35470-8341-43d1-a8c3-f83007934e86/comment_mettre_un_fond_sur_libreoffice.pdf
    • https://s3.amazonaws.com/sikuva/photo_cutting_software_apps.pdf
    • https://uploads.strikinglycdn.com/files/57c4516c-955c-4a22-b98a-65483c948234/hungry_shark_world_cheats_xbox_one.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77c.bin
9d96500692849ed06d05e485d03ec7554194a02d0825fd2fd163d417a359c2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 5308 bytes
font_01_sfnt_off0000f99b.bin
4bcf1122a3025247fc0eb8e6080ec38e89682d22aa4642ca41d339e489d8e6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 11280 bytes

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