Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1e30e601783ea1…

MALICIOUS

PDF

67.6 KB Created: 2020-11-11 22:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e1d1a46fe6d07b7f4eba0ca2009a005 SHA-1: 1d2b23d459d4cf72d57fe736b627068f7c36e1ab SHA-256: 3f1e30e601783ea1147b8265232a7c061619fe315bf533f57b45a4c15721dedd
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Weebly and Strikingly hosted PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (traffmen.ru), indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=istiklal+mar%25C5%259F%25C4%25B1+video+indir
    • https://lokowukaf.weebly.com/uploads/1/3/4/3/134315315/xixasivemoku.pdf
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5fa31fefa8b11.pdf
    • https://xexasatokotubeg.weebly.com/uploads/1/3/4/3/134354060/fukenonupozin.pdf
    • https://seguronudolag.weebly.com/uploads/1/3/4/4/134468074/a725a85e.pdf
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5fa5fb0ab333f.pdf
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5fa1e04b519c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f3598819-ee39-4a42-9707-5cb805867687/jawamujejupabulakanol.pdf
    • https://uploads.strikinglycdn.com/files/24229c02-ab79-401f-960b-c461f45a667d/powapixujoxibekanage.pdf
    • https://uploads.strikinglycdn.com/files/44d67896-db04-4658-84bc-419c0a128c36/78178569061.pdf
    • https://uploads.strikinglycdn.com/files/5c0bdbb8-a58e-4227-8c59-f08e17c814f0/39054528029.pdf
    • https://s3.amazonaws.com/rimepusox/cbse_class_11_chemistry_book_download.pdf
    • https://uploads.strikinglycdn.com/files/44a3a157-a50b-44d3-aa08-f7b1ed0d4e5d/moto_x3m_unblocked_games_76.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_off0000c5a8.bin
03ad8ba9a899ced955755a2dee57941ac29924a8b4b665daf75f5b97116917d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 5312 bytes
font_01_sfnt_off0000d72b.bin
a6ba9c557e2a7948f4620cad224fe2a70e9a9e71f6253d380a5d0c0854139ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 13284 bytes

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