Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f410d390a01a4e1…

MALICIOUS

PDF

74.2 KB Created: 2021-02-18 03:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 06e2cd3e6f9227432c348931c7f6881e SHA-1: 2884304f26e09eaba6450dab12918d5afbd16823 SHA-256: 3f410d390a01a4e1692bceb149f86e9fa95eb9b72c27d19a4337334f6ea6d189
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 numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('jottigo.ru') that appears to be part of a link farm. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it might be a generated document designed to obscure its malicious intent. The presence of many external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=let+the+devil+take+the+hindmost+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379489/normal_601718d141204.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Jgiibrk/free_editable_lesson_plan_template.pdfIn PDF document text
    • http://prizinsta365.site/cu2c2o4_nombre_qumico_para_sal_de_mbhma2.pdfIn PDF document text
    • https://cdn.sqhk.co/rasirise/eEXhcon/other_forms_of_government_issued_id.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/itjchh3/70807165185.pdfIn PDF document text
    • http://fruktovik.com/milulogibonijelejatmwei5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5ff5a33ba4e60.pdfIn PDF document text
    • http://appless.space/fuvoxatoluryy27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600e0c8d2f632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503767/normal_6019c900bbd0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ff5ddefa0ec5.pdfIn PDF document text
    • http://tuguxanofa.iblogger.org/druid_diablo_2_guide.pdfIn PDF document text
    • http://homebig.space/bexigiviputujesuviwozalij3gfir.pdfIn PDF document text
    • http://ketibenugato.22web.org/alain_soral_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/acute_prostatitis_treatment_guidelines_2012.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/84777163061.pdfIn PDF document text
    • http://bidemuv.rf.gd/attendance_sheet_excel.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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 5208 bytes
SHA-256: 19f1d9e1c15ccc1a52587526942c6cc4084da5b5ef1cde465bddbfe077419134
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 11724 bytes
SHA-256: 8acf9cccdff18a2011e26fbcb324f904231376d39c42f92bd7d5cfc92a1e3a8d

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