Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcd94f3813d0986…

MALICIOUS

PDF

61.9 KB Created: 2020-11-18 06:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 17bef1d55c50279fc80e0bd627629920 SHA-1: b367cb9e9b82c2998eb79e5d7a06d483d1d0ff2e SHA-256: fbcd94f3813d09863fbdb1468e3ed1107e976a4fa29f186288f75ac9e3a42186
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 numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URLs, 'https://trafftec.ru/123?utm_term=1.1+practice+a+answer+key', is flagged as suspicious and likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=1.1+practice+a+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fad3bdba2601.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/181483.pdfIn PDF document text
    • https://durezeneb.weebly.com/uploads/1/3/4/2/134235042/rogizix-lipevujovajaf.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/ba5dbaea-a3f6-4b16-a6ed-564c49d5fe79/10601299387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024005ee-f4e3-4780-a150-99332fedd587/house_of_lloyds_goa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532c964f-f181-4699-a39b-d30d9b7f90ef/26020859144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2448d3-966f-457e-9fbc-f47e9ab7b1b6/wwe_smackdown_vs_raw_pc_free_downloa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cebe18-cfa9-4eee-a914-e13b1a25b0d3/37203893763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272b8901-334c-4a79-8250-e66e837bf6de/92968828297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa236d65-f8e7-475c-8971-a75422988723/functionalist_perspective_criminal_justice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ccea21-2f34-4144-87ce-66a85f34a1dd/livigete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a57413b-31e3-42ba-8424-9b5687cdec77/kijosikewileruja.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_off0000b980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB980 5140 bytes
SHA-256: 01cf9a18783823a58fe3aa40a8307fd71babc3143e6970bdf9139ec3d3b405c9
font_01_sfnt_off0000cb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 9480 bytes
SHA-256: 5fead37503de1c4ea3736b56bb8c54b54000a3cb3a769d51eb0b65ed6ff98b3e

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