Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3cf5c97a57632b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 17:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cfb96b5032f5bfddaf5701b138a74d5 SHA-1: 710b45e7c1ed906dc4be981a4b12a49badbc07dc SHA-256: 6e3cf5c97a57632b0ee5eea6e875b49fdfd569fb9bcff2154c0fb7ce7d413d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary IOCs are the external URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://soxebez.ru/award?keyword=a+woman+of+no+importance+pdf
    • https://kifutojuwa.weebly.com/uploads/1/3/4/0/134017701/49c505b1.pdf
    • https://xusuberole.weebly.com/uploads/1/3/4/7/134744642/videginanuzitagilan.pdf
    • http://stavki.link/nature_beautiful_hd_wallpaper43ix2.pdf
    • https://cdn-cms.f-static.net/uploads/4379219/normal_605c690b71575.pdf
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/kajuramupokuvijejosu.pdf
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/dc2fee268c7.pdf
    • http://frasqen.online/13293722709pilf6.pdf
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/5fe95a5fc7f.pdf
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/6061232.pdf
    • http://liketime.fun/jadiwov6i50.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_606058dc1cae6.pdf
    • https://cdn-cms.f-static.net/uploads/4385852/normal_603351fe53208.pdf
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/2616593.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/584dc181-16b8-4abd-a626-0186bb802ec7/pigimotiveselesuzu.pdf
    • https://uploads.strikinglycdn.com/files/198d8eb8-3645-4f26-96b6-3ed4309834d3/whats_on_the_menu_at_sonic.pdf
    • https://uploads.strikinglycdn.com/files/6de650d7-ce36-4ce8-8d4f-475c337dec0e/14579865392.pdf
    • https://uploads.strikinglycdn.com/files/a45c6f56-3c28-40cf-9b03-9b7ede040f0f/canon_mx922_manual_paper_jam.pdf
    • https://uploads.strikinglycdn.com/files/c323b964-0c11-45eb-8a9f-5fc8bfc1dddf/mozirunafaxofukutab.pdf
    • https://uploads.strikinglycdn.com/files/bdb9110d-7309-4967-a056-eb60457fd82e/36108355336.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_off0000eaf8.bin
5a4ddb2764fc1e83dae04766fd0903518c1de8cef962c0876b1f82d718149d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 5172 bytes
font_01_sfnt_off0000fc8b.bin
0118351838f4174f068ab5c4cb35163d60bc47aee03dec426615788cc02062f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 11300 bytes

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