Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ed7f1fdb4952b5…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 02:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88971ff873372d3146180f93d9c4bce SHA-1: 7eee2909f6a045b27eb1251f730b0629be40b816 SHA-256: 84ed7f1fdb4952b5f4ed3441d69264f901ab43fe05d263954d0aeaf3813580d3
226 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a link farm designed to host numerous external PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to download a password-protected archive, a common tactic to evade gateway security. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/award?keyword=parker+autoclave+fittings+pdf
    • http://mobutadaxez.medianewsonline.com/97753409467.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fd85f4d89e9a.pdf
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/wuketejij_tagafafewaruj.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_603e5f231492c.pdf
    • https://jazujopu.weebly.com/uploads/1/3/0/8/130873842/mulur.pdf
    • http://keruluzo.medianewsonline.com/239882407.pdf
    • http://juponuziwotaga.mywebcommunity.org/46003177697.pdf
    • https://static.s123-cdn-static.com/uploads/4421783/normal_5ff25a5c7ed4b.pdf
    • http://xunarepozufuz.mygamesonline.org/vojadogixovup.pdf
    • https://mokovudome.weebly.com/uploads/1/3/4/5/134598928/644817.pdf
    • https://lolekujawifom.weebly.com/uploads/1/3/1/0/131070351/38dadeaacc55.pdf
    • http://mukinumatonewo.getenjoyment.net/91846888483.pdf
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/7168774.pdf
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5ff683dc7b6dc.pdf
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5feb97c52a168.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_46f8ce40aa4540938db18fe3d1c7a233.pdf?index=true
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_17738bd28a0a4f7594308569a7f041e8.pdf?index=true
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_aa01c662d94d4e459c48bf519dec4eb3.pdf?index=true
    • http://wutorokanotomav.onlinewebshop.net/42572714454.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_2d454ec60f3c42bbbd761ed25f95a994.pdf?index=true
    • http://nezugetojuf.myartsonline.com/17625769336.pdf
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_36671fde253f43e3922546217a440378.pdf?index=true
    • http://sofibimibojas.myartsonline.com/41062009701.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_off0000f46d.bin
2afd3bffa2246e1becfc2cb763bc07340683fbb49b0eea072dad8b1b76f7a6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 5448 bytes
font_01_sfnt_off00010717.bin
30c69ac2554cf867eb5efe8ddc68c3b46623b2e1b0efa9d0e62170e13d69cbc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 10972 bytes

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