Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f3068191d4b525…

MALICIOUS

PDF

75.5 KB Created: 2021-06-09 05:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e7770680854cbb5cf0366bdbdf1abfe SHA-1: 467f95f77a15a9d72ab0265c4c418724854d6527 SHA-256: d4f3068191d4b525d59f438affa045285bb9bf488cb9ed1d4f7f515fb91956bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting and are designed to redirect users to other PDF files, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, potentially leading to the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=ee+nagaraniki+emaindi+full+movie+movierulz+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425919/normal_5fe1879e75c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_602f8c7873af8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_6004c338a4c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_60bd24ab1b064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_605677b7263ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ff4609286844.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379973/normal_60028f11a9a28.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368752/normal_60b1d227372cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421983/normal_5fd3b9c851f44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_605feaa997192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_602a25b6b1bc6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485454/normal_60b6036003341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_60541d46ef6bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_6040ab454c108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_603f17058258d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajejor.pbworks.com/f/gifugedewa.pdfIn PDF document text
    • http://buwutel.pbworks.com/w/file/fetch/144673353/best_100_mile_training_plan.pdfIn PDF document text
    • http://xifatarege.pbworks.com/f/free_daily_reading_comprehension_grade_1.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144504438/fallout_new_vegas_energy_weapon_guide.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144515181/simple_compound_and_complex_sentences_rules_table.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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 5272 bytes
SHA-256: e848f31b8ef67978d7ee38b3e8c94919bb432245cea31d3806e498dbd98bbd54
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 10660 bytes
SHA-256: 3ee0d61c7f4cd746127ca28de3ebf48c2a2a87bdc3575e30dcf7e4a251e8a1ac

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