Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0edcbc7ba7ec9d0…

MALICIOUS

PDF

71.7 KB Created: 2020-11-23 02:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b92abafa8fd1269959749ad15899f0c9 SHA-1: 5e45b5269053fb4a32a48b608c80637d9fc244ab SHA-256: c0edcbc7ba7ec9d07344ab0aaba8d33ac10640b589ae152b17d942034e0c1096
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=molar+mass+of+pure+benzoic+acid
    • https://babunugigexi.weebly.com/uploads/1/3/4/5/134582988/0dc60d.pdf
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5f90bb5662fb5.pdf
    • https://fifevogu.weebly.com/uploads/1/3/4/6/134602809/rajoso_gesoziwena_nubaku_zetizimisojakaj.pdf
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/8376192.pdf
    • https://gejomomik.weebly.com/uploads/1/3/4/7/134719116/5009476.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/f1a75626ec5047c.pdf
    • https://cdn-cms.f-static.net/uploads/4487413/normal_5fad7b3cb7437.pdf
    • https://toxejezewigi.weebly.com/uploads/1/3/4/5/134513259/9682406.pdf
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/kutimixufabidagupiv.pdf
    • https://budaxopam.weebly.com/uploads/1/3/4/7/134711784/fuselinas.pdf
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/182d19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3d111b32-c55e-4c1e-bb85-b1e2cf9b38a2/92029202219.pdf
    • https://uploads.strikinglycdn.com/files/f050e0a9-57a9-42e4-bf9d-3ff0e158b37e/puwogolurifunigazigili.pdf
    • https://uploads.strikinglycdn.com/files/3a8427b8-9409-49a3-8a74-fb1ae9b05100/examples_of_sight_sensory_details.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_off0000da85.bin
67f3fd51ce124bc47647efee913041e691e5af9ee1948ea0b2ec4d37a9827cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 5496 bytes
font_01_sfnt_off0000ed2b.bin
d520bb1760ea9303a9bebc724401f7d1838ef6be48f55107343b9bb48d5d7fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 10920 bytes

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