Malicious PDF — malware analysis report

Static analysis result for SHA-256 0148df68a3fe9e98…

MALICIOUS

PDF

75.6 KB Created: 2021-03-25 01:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf17cb5cf9d4737cd876af073db41eef SHA-1: 7bfa015ac241da8322a7a9de8e2c4df9d035d186 SHA-256: 0148df68a3fe9e980ad75fc85c30f80a845329b43fff9864167db4f5f8511429
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm designed to host malicious PDFs. The embedded URL `https://gimoguvi.ru/award?keyword=greek+mythology+short+stories+pdf` suggests a lure to download further malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=greek+mythology+short+stories+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377113/normal_60355166e9016.pdfIn PDF document text
    • http://remontnatali.ru/watugubanqjvd.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/bajbhgI/billie_eilish_wallpaper_hd_computer.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/google_cloud_security_certification_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6009d1455b181.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/vukevojoxanokoloro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_60236e1424411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_6009f877d9427.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/hernia_hiatal_en_perros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_604f2bf431f03.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/ajemjg2/bubble_story_book.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/7970723028.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/7QghsoI/40995780421.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/ifU4iin/wuwekavabixabokujevur.pdfIn PDF document text
    • http://fresh-ita.fun/55558619787758vx.pdfIn PDF document text
    • http://peramabejakes.sportsontheweb.net/kujodeze.pdfIn PDF document text
    • http://wonder-ita.fun/what_is_the_most_rare_monster_high_dollx331w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikanelomer.onlinewebshop.net/jepufujikifurunodek.pdfIn PDF document text
    • http://gotakedadonere.rf.gd/chemical_bonding_worksheet_chapter_6_review.pdfIn PDF document text
    • http://wewamamewiler.atwebpages.com/nevisoruv.pdfIn PDF document text
    • http://wokobunowome.epizy.com/mazuw.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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5440 bytes
SHA-256: 4001a1f31b3b1ebeeaf32b30ae1dabd5e0624aa5250b20cc899c5daf7d0cb1ba
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 11176 bytes
SHA-256: bd19e83ca5adf696b25b17a5971866e7ae3d09a014f762f1e38f591b39bb6a8e

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