Malicious PDF — malware analysis report

Static analysis result for SHA-256 648bc956e418fa3b…

MALICIOUS

PDF

84.1 KB Created: 2021-04-25 15:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4ece4e211d2c74d08d12428190df2208 SHA-1: 91a3eacf9486055a7f1c0a4fe42eef012840c383 SHA-256: 648bc956e418fa3bcb4f2f96327c3d38adf39fa0e443c02831bac850b4b55cdd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Hatchet novel by gary paulsen' and is associated with numerous external URLs, many hosted on disposable domains, indicating a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=hatchet+novel+by+gary+paulsen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389365/normal_60541e92ac5b1.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/administracion_de_empresas_turisticas.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/overview_of_computer_programming_languages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd1458831692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_6063798b9c7b7.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/rilufavidezaxo.pdfIn PDF document text
    • http://jugapus.sportsontheweb.net/26866477903.pdfIn PDF document text
    • http://xevedudox.sportsontheweb.net/93138689077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5feea4cf16873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_605b8dbf24868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_605974f9a3621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472204/normal_5fde79d5099d7.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/kubuvilarusupefonu.pdfIn PDF document text
    • http://lutefadeba.scienceontheweb.net/berlin_definition_of_ards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fdb5f6283e01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6be9ce21-2190-4376-9a35-e6b3c4f8856a/jordan_belfort_way_of_the_wolf_resources.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/digital_signal_processing_using_matlab_for_students_and_researchers.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/buvawalitotumafaxiw.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/57465933629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33d1811-c6d2-417d-ab61-ddd9bacf3734/rovifomizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d84b8ce-6a86-4fdc-ba3b-8990df9d6882/what_is_the_full_meaning_of_misguided.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa4ecd3-8ba4-4cd0-8ff5-89482258fa30/64657769730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624f0d2e-d1ae-42df-87bf-c96124948dc9/nuzavamor.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/how_to_reset_thermostat_nest.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 5292 bytes
SHA-256: bdf66743503483018d6b94eca49ee22fac526d9b1b74fdf81c5c20c6562bc24c
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 12048 bytes
SHA-256: 3bb08a1f4e29af58575a4a4c5587b7118d99c969e768bf3a5090a342d831f4e4
font_02_sfnt_off00013356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13356 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378