Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9320abfefd651de…

MALICIOUS

PDF

82.6 KB Created: 2021-04-05 00:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e6ce5f99c6b8254a317af4bd2911edf8 SHA-1: 75a8a5dada4a7025f50f9bf79b464235a1a4fe16 SHA-256: f9320abfefd651de4bab1c85f2ec3d3b35834a3dfe283b78d3e3487599130596
126 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 external URI pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata indicating it was generated by 'wkhtmltopdf', suggesting it might be a crafted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=millennial+generation+research+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379837/normal_606676203bea1.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/gastrulacion_en_peces.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/neuritis_intercostal_tratamiento.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484807/normal_5fe1c1d255981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472763/normal_5ffa41213e0a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5fdd97449bd47.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/strength_training_anatomy_3rd_edition_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f87c24c-b966-4e7e-aa40-d57b3259b0a6/how_to_calculate_turns_ratio_in_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/komip.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/36362169349.pdfIn PDF document text
    • http://kezavigubanize.epizy.com/2010_bass_buggy_pontoon_for_sale.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/birowukin.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_f381c9a9ab1f49cca579bf306968660e.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_96ceca737f86449f9ddac8988f04ccd1.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_2960eada79684abe944c3b332a88fc3a.pdf?index=trueIn PDF document text
    • http://kopuperoki.epizy.com/idioms_worksheet_for_grade_7_with_answers.pdfIn PDF document text
    • http://jexititojule.rf.gd/83816683405.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/runizunoxera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3981de-2860-4b37-a16e-46919f90b73b/67695631390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762927b2-4eb2-4373-b97e-32d568f3c802/82914990057.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_f3b549e8bc66453c9ac559e3164d22b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e35746-95f7-4217-a549-87c90b968494/8007277716.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 5424 bytes
SHA-256: e2140f4fb0d183a0156c6e8b8cd7876792cc6bb0beea4172aaaf1332b36342b0
font_01_sfnt_off000116e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 11204 bytes
SHA-256: bc736d2963144c3d83c3da399b6da9ef1ae3d05643da83ecc49e195d9651c598

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