Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf6c40f0cbe0973…

MALICIOUS

PDF

68.9 KB Created: 2020-11-10 17:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1b81c3ed4ac681958c7210aa9fd8e1e8 SHA-1: 1dad639057018e144018205eb9186b471c5c7c5e SHA-256: aaf6c40f0cbe09735d14529d032c735e3e4d74b0301ae8613f14e6e242d84ec6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for a "PDF_SEO_LINK_FARM", indicating it links to a large number of external PDFs. One of the primary external links is to "https://trafftec.ru/strik?keyword=bucket+fillers+program", which is likely a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, possibly related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a link farm or SEO manipulation tactic.

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://trafftec.ru/strik?keyword=bucket+fillers+program PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8ddf4e0d619.pdfIn PDF document text
    • https://wafulerafi.weebly.com/uploads/1/3/4/5/134503758/takaverelasejof.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/kemadifenozegi_dupovema_pukoxapexe.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/96cc6ee1-9c5d-4539-bdd8-1ade0b6b343f/50_shades_darker_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcab32f7-102c-4f8c-b32e-6f67a0ed127f/73782469559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158a473e-e47a-4a09-aaa3-b6bec9f69a45/xibinuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3f6881-f073-40ab-97c3-0986fe46b044/kiworanuzepuzup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5edb6e8-5041-4432-babb-66bd00aa4b72/puxamupom.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/public_policy_analysis_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/nafidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ddcdbd-bd50-48a4-9358-719cfdc3dde4/gujati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ae425f-c179-4cb2-83da-0ac90c76f80d/gorujagutofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8884caf4-1fdb-4f7d-88ee-1db2a80ce2a8/bikupijamezofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f210ce-0938-4b01-a48c-2efb6eebeea7/98062152883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2ff1c3-8bf8-4f83-8d6e-8b5cbd5f25b2/88556163630.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_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 5448 bytes
SHA-256: b9fc2ad9846ab598d0f56bd4360a52d58cd7acfbc390f66a71a53fecb576bc3f
font_01_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 11016 bytes
SHA-256: f5ab367142d66136848e16b47483682338377123346b87f6cfc7fccab982ca3e

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