Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28fc6ec7fa53897…

MALICIOUS

PDF

81.7 KB Created: 2021-06-06 04:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 403ac7606840d3050b7f13f0c6e93ba4 SHA-1: 98d8c41c36c861e0ebb07163049f0ad4a704ae49 SHA-256: f28fc6ec7fa538975c770a40a5ca99124651b5a66d3be218ad13be2e0ac916c9
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain ('synerhu.ru') disguised as a software download. Heuristics indicate the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/pbw?utm_term=8+bit+music+maker+software+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366958/normal_6019bf140736b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_605ee1aecf426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477620/normal_5ff43956cf221.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/dowolajepiruwuwoto.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/4871201.pdfIn PDF document text
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/pubatavovawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://difusowafid.pbworks.com/f/50582496234.pdfIn PDF document text
    • http://lifevuve.pbworks.com/f/10_snf_biyoloji_ders_kitab_berkay_yaynlar.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144536964/what_grills_are_comparable_to_weber.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/mixed_tenses_exercises_with_answers_for_grade_8.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/w/file/fetch/144576330/76143903608.pdfIn PDF document text
    • http://kuxuraroj.pbworks.com/f/tracing_alphabet_worksheets_free_printable.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/maize_production_business_plan_sample.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/w/file/fetch/144591441/connecting_networks_version_6.0_-_cn_chapter_1_exam.pdfIn PDF document text
    • http://zetewufor.pbworks.com/f/how_to_reset_jvc_kw-v230bt.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/5_reasons_why_capitalism_is_better_than_socialism.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/togonaxiwufuxiwuvogapur.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/f/annual_leave_form_template_word.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144481377/vepogegonorasefutise.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_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 5560 bytes
SHA-256: 23a9cb904408170daae29e467f6bc94ec3e3c9451729ba5f09d3c657813ce4f1
font_01_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 10736 bytes
SHA-256: 8ad22395304833ed6c8e632b54495b5df5d13a5918759bf7cc49de5bef0dfbf0

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