Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfce58a8f33e3a5…

MALICIOUS

PDF

80.7 KB Created: 2021-03-21 03:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b01d50c098d3287b30403d20ba2cc8af SHA-1: 5b0d11894b17712f501ca38ed2531fd374e009a9 SHA-256: 9dfce58a8f33e3a50ece13bb48d10c30f275d7d728d6bd47c6d975de116eb2a4
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'seumenha.ru', which is likely part of a phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a document. No scripts were extracted, but the presence of external URIs and the malware detection strongly indicate a phishing attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/award?keyword=accounting+theory+7th+edition+pdf
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5fde869977da7.pdf
    • http://sfr-espace.best/dungeon_siege_2_no_mouseeyo5j.pdf
    • https://cdn-cms.f-static.net/uploads/4393632/normal_6031c245a089e.pdf
    • https://cdn-cms.f-static.net/uploads/4381730/normal_603a238145f60.pdf
    • http://bigowet.xyz/60911092493k17mj.pdf
    • http://tameeniraq.com/35795664804yos9s.pdf
    • https://cdn-cms.f-static.net/uploads/4456372/normal_6026dbc31a038.pdf
    • https://static.s123-cdn-static.com/uploads/4443602/normal_5fe3ffd4e6c44.pdf
    • http://sneakerspapa.store/15017767286pfgks.pdf
    • http://lifeshop.pro/bangalore_university_revaluation_formjq16y.pdf
    • http://goproits.com/mivituzulisagewiduroko203me.pdf
    • http://argo-tourism.com/spring_framework_version_upgrade6uodn.pdf
    • http://idealslimitalia-official.site/gikapamij2a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6087c22-7a81-4c5c-8960-7273e64965dd/how_many_calories_are_in_a_crunchy_taco_supreme.pdf
    • https://uploads.strikinglycdn.com/files/f007c30d-d8f5-468d-9322-60660d43b352/moultrie_a-20_setup.pdf
    • https://uploads.strikinglycdn.com/files/f8276c12-3b83-45a9-aa1c-1a15b93ffe6e/74828798130.pdf
    • https://uploads.strikinglycdn.com/files/417746cf-1052-4e3e-bfe9-59a50d8eab28/mastering_vmware_vsphere_6.7_free.pdf
    • https://uploads.strikinglycdn.com/files/0eabcfb9-b203-40c1-9578-71d8aa605a68/introduction_to_game_design_prototyping_and_development_download.pdf
    • https://uploads.strikinglycdn.com/files/566a6ce7-36d8-4b4c-a590-81becfd98d6f/dell_inspiron_570_16gb_ram.pdf
    • https://uploads.strikinglycdn.com/files/00564da9-7543-40ef-83cd-e85692ee364f/how_to_do_cosmetic_tattooing.pdf
    • https://uploads.strikinglycdn.com/files/b841cb8c-a9e9-4c24-a196-62dec8e35d11/28810819251.pdf
    • https://uploads.strikinglycdn.com/files/a65a166d-d10a-43f3-9c95-d9ccd1c442e0/wedazi.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_off0000ff4e.bin
303d6dd5112bb17e45c25adbfad8ee2e7a12b0fcffc8a467088bbd76c3821a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 5168 bytes
font_01_sfnt_off000110f7.bin
a0f98aa53d7b98b49700ecbff3bfa70eba7a32415bb3226afff5b60f2cc4d657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 10172 bytes

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