Malicious PDF — malware analysis report

Static analysis result for SHA-256 79061f1f95ff7e5a…

MALICIOUS

PDF

58.9 KB Created: 2020-12-23 22:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0530f4ed6cec378f9352da9931e6998 SHA-1: d700d651077812e0c8115c0fe27cc4774fc1bb84 SHA-256: 79061f1f95ff7e5af57eca1a7193b8a11346d5ef7dc1d3073a2a812ae9c02954
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily corrupted, suggests a lure related to a 'formal agreement'. The presence of numerous external links, many pointing to PDF files, indicates a link farm or redirection strategy to distribute malicious content or phish users. No scripts were extracted, but the PDF structure and link analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/123?utm_term=formal+agreement+between+two+or+more+parties+crossword+clue
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5fb712ffcb76d.pdf
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5f8f5df31bffb.pdf
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5f9fcba84a5b0.pdf
    • https://cdn-cms.f-static.net/uploads/4472494/normal_5fbf2d8c69e05.pdf
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5f8a28fd38868.pdf
    • https://cdn-cms.f-static.net/uploads/4413121/normal_5f96c15e6dbce.pdf
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f9f7a57e46f9.pdf
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/zisomuzapubav_fukosojiz_vewosuzoleti.pdf
    • https://cdn.sqhk.co/zirimikuj/RZimhwQ/69332624621.pdf
    • https://cdn.sqhk.co/xibumediw/j9hjge8/amazon_seller_account_uae_requirements.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b11bc08-6c1c-4927-8fa2-83838c6e7909/sajerajoxuvobuf.pdf
    • https://uploads.strikinglycdn.com/files/09156597-0904-4b6b-821a-42fabda71418/permuted_lu_factorization_calculator.pdf
    • https://uploads.strikinglycdn.com/files/28d1494d-6387-463b-acff-2bbad6cc38a5/fatowexamijinirutelegiwe.pdf
    • https://uploads.strikinglycdn.com/files/2f77f12c-24ee-4cbe-92ee-fb283f660d20/the_most_dangerous_game_active_readi.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_off0000aac6.bin
c64d75965bb603e1b0a21e276254f755041db8c64d46aa6e5f572fe97250ecee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC6 5580 bytes
font_01_sfnt_off0000bdb0.bin
31aa8284069ae840fd73014d086e0335388a6f9417a41e7526832f99e0215c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB0 9592 bytes

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