Malicious PDF — malware analysis report

Static analysis result for SHA-256 5152b043c3a8ef4c…

MALICIOUS

PDF

69.3 KB Created: 2020-12-16 20:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce23f224bbd58f396d6d60340cd18d72 SHA-1: e89cb95f751fe2ad94de8cd5fef1121220eea5b6 SHA-256: 5152b043c3a8ef4c307c82c2b1a92c4f94b032dd16ff888249837d98f791cc80
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to trick users into revealing sensitive information like private keys or backup codes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://trafficel.ru/strik?utm_term=godaddy+hosting+free+ssl
    • https://kovibokasekur.weebly.com/uploads/1/3/4/8/134880184/74d39834.pdf
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/mevuwazufoxaku_nobewukes_nukez_sigozunakir.pdf
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5fb3c80403e4e.pdf
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fcba866be163.pdf
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/9578795.pdf
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5fcc1a708f565.pdf
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/binuzepanes.pdf
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/tidaparuruno.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f9b7260f3086.pdf
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/273f2ad9cfc35.pdf
    • https://static.s123-cdn-static.com/uploads/4492586/normal_5fc63cb46bfef.pdf
    • http://<YOUR_DOMAIN>//.known/acme-challenge/<TOKEN&gt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e1bb6481-a7e5-4640-969f-4f91a28183f2/lirelimadikenewodidu.pdf
    • https://uploads.strikinglycdn.com/files/121df49b-57ee-48ce-8686-f9984b289918/small_angle_approximation_khan_academy.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_off0000d158.bin
87a2d604fe4d5422c7c53065c02b2810b9d37c77809cda5ab8c8838048842c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 5300 bytes
font_01_sfnt_off0000e365.bin
138b8c017c459e381c639bdb3199cb95a164457bd6b8e429a66396e0292bb531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 10960 bytes

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