Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b0881151116b6f…

MALICIOUS

PDF

87.7 KB Created: 2021-03-19 12:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 438e1e377a90d08bb65ab2a1be065508 SHA-1: 535d5a8e4d69998c7b8aecbfc610870b1410856d SHA-256: a3b0881151116b6fd68767d3d4767a9df4b03ba51d027261f99064b69f6c568c
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to a suspicious domain. The presence of external URIs and the ML classifier strongly indicate malicious intent, likely to deliver a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=sun+elf+family+names
    • http://mokaxizekebade.scienceontheweb.net/53569502825.pdf
    • http://zisapawiwako.mypressonline.com/neoliberalismo_no_brasil.pdf
    • http://fonixeguga.mywebcommunity.org/tactics_for_listening_elementary.pdf
    • http://nezowigivomi.scienceontheweb.net/85581841457.pdf
    • https://static.s123-cdn-static.com/uploads/4366665/normal_6002b6f4e6847.pdf
    • https://cdn-cms.f-static.net/uploads/4460243/normal_601b5043d9fc4.pdf
    • https://cdn-cms.f-static.net/uploads/4499636/normal_6036a497a286d.pdf
    • http://dabukim.mygamesonline.org/engineering_manager_job_description.pdf
    • https://cdn-cms.f-static.net/uploads/4417024/normal_5fd63855a6d52.pdf
    • https://cdn-cms.f-static.net/uploads/4426277/normal_603d976b99d38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://teluroluxeterez.myartsonline.com/present_perfect_just_already_yet_grammar.pdf
    • http://rigidafavubo.myartsonline.com/nanawepafazaganifaramuxe.pdf
    • https://s3.amazonaws.com/pozokimepe/99121064491.pdf
    • https://s3.amazonaws.com/zonivezada/56170292732.pdf
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_e555cbfd87404da99d7cb40a755301d2.pdf?index=true
    • http://kepawomokatuke.myartsonline.com/reduction_formula_integration_by_parts.pdf
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_79c4b84baf3d4be08d9554621247c895.pdf?index=true
    • http://pabewuvuxaf.onlinewebshop.net/vubebasirilusadolato.pdf
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_1183442bb92947febcaf58050af4f929.pdf?index=true
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_023bc0defcb74ecf8490074135b4f67b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/945853b6-bff7-4c49-b2ce-9d196f86aa2d/40156740847.pdf
    • https://uploads.strikinglycdn.com/files/955bcfed-6ce7-46dc-9f41-6632fb4cc991/the_tragedy_ofthe_commons_hardin_1968.pdf
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_a3aa060329b04f3e969c7ca5bb10b1f5.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_off00011c9f.bin
5ee2ed993c3cff0bf7976f175674e6ec5e88ece774d3a3b372fc3757d34954a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 5024 bytes
font_01_sfnt_off00012db1.bin
8a7fd3f3764364c886220ad44d0dde29d883c2716391a3e0f7eccc8d72cc7464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 10784 bytes

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