Malicious PDF — malware analysis report

Static analysis result for SHA-256 720ac4ccaf7a8490…

MALICIOUS

PDF

73.5 KB Created: 2021-03-15 23:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4a7538760ce1f5fca073c54b783e77 SHA-1: d1ac01ed1dad9e86558e057b3bc7210df16f6aff SHA-256: 720ac4ccaf7a8490b3fc4740515b7f97e7146c368b617ab3fcfa2be04f8a2add
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by multiple heuristics as malicious, including a critical finding for a link farm and a ClamAV detection for a phishing trojan. The ML classifier also returned a high confidence score for maliciousness. The document contains numerous external links, with one prominent URL pointing to 'soxebez.ru', suggesting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=newsletter+mockup+free
    • https://static.s123-cdn-static.com/uploads/4404983/normal_5fc73bed629c7.pdf
    • https://static.s123-cdn-static.com/uploads/4448339/normal_5ff9cebfe1079.pdf
    • https://cdn-cms.f-static.net/uploads/4448539/normal_603823c47da4d.pdf
    • https://dibirumozogu.weebly.com/uploads/1/3/4/6/134611192/togotosateken_podefimifojovim_tazukovenovona_kamis.pdf
    • https://cdn-cms.f-static.net/uploads/4426697/normal_6016bb5122f91.pdf
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/wuvudexu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_7ec00e63dcde44559d19c32c7e7c678d.pdf?index=true
    • http://zuzopejorexa.onlinewebshop.net/64648597911.pdf
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_fa15d7c13bd1424ba335b06584b927be.pdf?index=true
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_f89b1e6a2bb0452d8d59d01fd09476c7.pdf?index=true
    • https://94905bf1-e21c-4e9b-b893-f07ea1e46b09.filesusr.com/ugd/8ff694_68932de15ddb4ca1971cba7fca212856.pdf?index=true
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_6719defc8e9b4f59a8c0210e6bf519f1.pdf?index=true
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_9dc44ae038c04081ab57fe1ae0c412bf.pdf?index=true
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_d9c198ca67834295a96b7fd1bda11f17.pdf?index=true
    • http://tuxefunuzire.atwebpages.com/bones_of_the_pectoral_girdle_and_upper_limb.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_a1f18820d73343ed83c106f1f2e62c96.pdf?index=true
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_b537255b79464f91b4b60d2297b00819.pdf?index=true
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_e3ea9a7872754de2bd50b070e398514c.pdf?index=true
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_e2b108fa8c9e437881e95c9a88258ce7.pdf?index=true
    • 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_off0000e266.bin
b0631dd5b5c54eaeb1e6b0b390c189135051e0e60460a7c3e18c4d0a61aa1524		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 5076 bytes
font_01_sfnt_off0000f3b5.bin
15b2793d96a7af987c484ff1a4ba0d83794b0476b70df1eeffd862b74c1f48f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 10976 bytes

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