Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5107ba2d8770388…

MALICIOUS

PDF

73.5 KB Created: 2021-01-11 23:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b2a0609731598bd96473f4cf96e19982 SHA-1: 3949d36612e10dc1cd3f10359a85dec88131f7f4 SHA-256: e5107ba2d87703880170fdd09eaa913dce7c54cf600d2e1afde0cc5292124b39
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded URLs that point to external PDF documents, suggesting a link farm or redirection strategy. One of the primary URLs, 'https://traffmen.ru/aws?utm_term=androidx+support+library+versions', is identified as a known malicious redirector. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of the link farm and malicious redirector strongly suggests a phishing or malware distribution attempt.

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
  • 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.
  • 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/aws?utm_term=androidx+support+library+versions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5fada28eba55f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5ffa26fd49598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f913e68d7005.pdfIn PDF document text
    • https://gajegewajutop.weebly.com/uploads/1/3/0/7/130739456/jowokox-boguwigomepi-riretina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f874d32d1857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5fbc31ac46ded.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/pajonoxogigoko-buxaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5fe59acd46721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382196/normal_5fcfe91c818ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5fb2a514192c5.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/parav.pdfIn PDF document text
    • https://cdn.sqhk.co/zevivovakok/X6OQric/play_online_3d_boat_racing_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f9bcf745772e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fce6fdbc5a4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 5312 bytes
SHA-256: c4a851424723c237b36f127ca609ed118b41e9d10277a35569e86eb205d88b03
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 13572 bytes
SHA-256: bff5d7ed156b9f84cff269eb15cc92d325b0815bf1c1b456ba6db92caa6be57f

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