Malicious PDF — malware analysis report

Static analysis result for SHA-256 b697d6dcac608cfc…

MALICIOUS

PDF

77.6 KB Created: 2021-03-12 10:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eaaa9ef87d88389d5116321f30e5f5e SHA-1: 7b441c3e85907dec6f8dc3f1fd307274ce7a6b49 SHA-256: b697d6dcac608cfc4e135156e97505014037cbd4ac6e440c09d936b023a4f1ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs points to a suspicious domain 'lozipotod.ru'. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent, likely related to phishing or distributing further malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=the+westing+game+novel+study+pdf
    • https://sorafenime.weebly.com/uploads/1/3/4/3/134320910/bikupet_kadupug.pdf
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601f03ccf342b.pdf
    • https://kudarori.weebly.com/uploads/1/3/5/9/135960502/77dc4a11de0.pdf
    • https://tilapenudulaw.weebly.com/uploads/1/3/1/6/131607943/wabesotakokot.pdf
    • https://nabiwadi.weebly.com/uploads/1/3/5/2/135298838/nepajekinurak.pdf
    • https://static.s123-cdn-static.com/uploads/4402740/normal_60076ea38a00e.pdf
    • http://sport-stavki.fun/tavigaxokukepisoxomark6igg.pdf
    • http://nakrutkavk.site/the_ecology_of_human_development_experiments_by_nature_and_design_citation2w1yt.pdf
    • http://biotringel.shop/hand_operated_sheet_metal_foldern7glm.pdf
    • https://cdn-cms.f-static.net/uploads/4486763/normal_60278e0c85723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b95c0a34-31c8-4b87-9c4b-c5b106807f26/77854439352.pdf
    • https://s3.amazonaws.com/donukadizolin/pibexugaru.pdf
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_28d158ee9a6f471bb64a9fa7066646a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d0f3422-c1a1-4f64-b2f8-4c473e507718/jogizokazufijusukixinejug.pdf
    • https://uploads.strikinglycdn.com/files/557183ec-d11d-491f-9c03-0c82abde8446/68080860863.pdf
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_fa7fcb054a044cfdac2c826e5566935b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48fc679a-a487-4188-9eb8-f450f191d5ee/whirlpool_duet_sport_washer_maintenance.pdf
    • https://s3.amazonaws.com/bokexizometun/alan_wake_pc_highly_compressed.pdf
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_acf6c2c5d39e47ecb41d697e7f1ed299.pdf?index=true
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_2dea1518ab114ecabd5ca01d6afd4a98.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_off0000f2e7.bin
56d47be9bbeb2b5b5c86d9a36e578177851960f01c090f07db4bc806675f9712		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5564 bytes
font_01_sfnt_off000105d0.bin
469d1bae58d930ca31d8dab49456ea3690a62335f517f0eb9e713284e157d41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 10408 bytes

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