Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0df2ef4b79d788…

MALICIOUS

PDF

86.6 KB Created: 2021-04-01 01:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f193bf9fa0950b9d4690fc74462a010e SHA-1: ccf52f48f2d9c7ca55f5ed47193b998edaeb1d6a SHA-256: 3a0df2ef4b79d78800d69dc7a9f68a461bcf93ffd19401feb557c7939c3cd271
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=poe+izaro+guide+deutsch PDF link annotation
    • http://prizinsta.online/10634197532iyez1.pdfIn PDF document text
    • http://aires.fun/125274006525phvw.pdfIn PDF document text
    • http://steblin.pro/the_wisdom_of_insecurity_by_alan_watts6aefz.pdfIn PDF document text
    • http://eurofamily.pro/60460671979taj9r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_604c96836d53f.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/94592165440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_60246ed471653.pdfIn PDF document text
    • http://opros.xyz/el_hobbit_1977_descargarmkzut.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/jopojotomufiwepakes.pdfIn PDF document text
    • http://help-verification.com/sex_coloring_book_pagesolpng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_605b3b9f4b6ee.pdfIn PDF document text
    • http://changely.club/dezazupavunasufetofiralitkebx.pdfIn PDF document text
    • http://kismykeitio.best/nobubonkero.pdfIn PDF document text
    • http://iglivesupportteam.com/rosogiwepanezatehlqgh.pdfIn PDF document text
    • http://pixxel.life/windows_server_2012r2_support_end_of_life3cmke.pdfIn PDF document text
    • http://lavka-karamel.ru/pathfinder_2e_core_rulebook_free_download7pmf2.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/edexcel_further_maths_textbook.pdfIn PDF document text
    • http://geekcods.com/99331251791y2e01.pdfIn PDF document text
    • http://mx50off.info/blouse_design_back_videocbvzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_5fd9aa5b7f54d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_605aa65c2c754.pdfIn PDF document text
    • http://mavpa.fun/safety_dance_song_parodybbudn.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/sojaxub/20971875098.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/xunimubifikuxogitati.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/john_deere_l120_48_inch_mower_deck_belt_replacement.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_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 5220 bytes
SHA-256: 225419f386520ab302906e2e7cbabf1376bad09596bfc4e21ace33e31f727190
font_01_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 11316 bytes
SHA-256: 09056ef04f5e49b4233096d188b19888e4a5ab0c28c77bd506e0d81bfd84f937

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