Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67c5e153190c968…

MALICIOUS

PDF

81.0 KB Created: 2021-02-14 11:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a63a267a0f6dad7caa5a3bd2176a1cc2 SHA-1: 776b0b706378a5effb980d4c9a61969ae6690f61 SHA-256: f67c5e153190c968e9d0b3151401fe0c8bbf88003fdf2f489e48dddf8d1a1ce9
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 URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The presence of a URL with a search query related to a common educational topic suggests a phishing or scam attempt to lure unsuspecting users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://bologen.ru/123?utm_term=what+connects+the+respiratory+and+circulatory+systems+brainly PDF link annotation
    • http://busibear.com/jw_watchtower_societyl6d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_5fe730912b816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5fcf63ffb7e00.pdfIn PDF document text
    • http://organicnu.info/genolopubipasinusukudtyd0i.pdfIn PDF document text
    • http://domsale.xyz/glass_castle_movie_parents_guiderpy4x.pdfIn PDF document text
    • http://wigigokewadusad.iblogger.org/66915411861.pdfIn PDF document text
    • http://shoplus.info/19304338821u93ut.pdfIn PDF document text
    • http://alcexpress1.xyz/lajebovufozulutepilagixssdz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_5fee31e3c5e0a.pdfIn PDF document text
    • http://guwugil.22web.org/21176404979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5fe39445c5dab.pdfIn PDF document text
    • http://prolac.ru/asterix_and_obelix_meet_cleopatra_parents_guide7fulw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_6028e93cee397.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://s3.amazonaws.com/dorobukasawituw/loser_like_me_sheet_music.pdfIn PDF document text
    • http://lidiwerefibe.rf.gd/taranegonizeranajapebuf.pdfIn PDF document text
    • http://ridurosumebo.epizy.com/guided_reading_lesson_plan_for_preschool.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_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 5452 bytes
SHA-256: 654c56158c6b3f62afa7391d14e92a560f87dbf325abe216306a3ef7edfb5f3c
font_01_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 10196 bytes
SHA-256: 531d5bdc0c51ab6b396b8471acfae19848a8d723aa8c9c40380d3be208acaeb7
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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