Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25ef971bb882585…

MALICIOUS

PDF

72.9 KB Created: 2021-04-01 08:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5e10c8a8f0c7a3abbd571dc1e1ebba4b SHA-1: ea716b15a55c935fbcc7ba78c0234d089220997d SHA-256: f25ef971bb882585e9f4a487ff3ceb48ce202b50194331286504f0d3b2b74fe7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links designed to manipulate search engine results or distribute malware. The ClamAV detection and ML classifier also strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=as9100+rev+d+quality+manual+example PDF link annotation
    • http://jasazotinalol.mygamesonline.org/33574546784.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/je9NoNm/archery_tournament_flash_games.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/89630923807.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/8hagj1S/tinkle_razor_face_shaving.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_601d0d88d4745.pdfIn PDF document text
    • https://cdn.sqhk.co/senogewuki/nQyhehg/fashion_beat_mod_apk_unlimited_money.pdfIn PDF document text
    • http://mipexalazalekab.getenjoyment.net/jazovefelisevutepeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5fc8b8d3b577f.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/wolina/sulovufunekufabofutazi.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/89191237176.pdfIn PDF document text
    • https://26b54b0d-7067-4615-bd5a-e9f638bc9197.filesusr.com/ugd/26f5b5_382f5d4dbaf5473daa28c965e474d9a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/61912413511.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/45559561518.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/craftsman_dgs_6500_mower_deck_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/aftershokz_trekz_titanium_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/zazojisanuzabejawajud.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/dafasedebavevetovapita.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/how_much_does_a_union_pipefitter_make_in_ohio.pdfIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/kirby_vacuum_service_locations_uk.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_9dd632bf33a34ec8b8a8e86585f4750f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/34574700941.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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 5800 bytes
SHA-256: 7d011503e087cd8a5e053ed7ef866d898ebd087ed6cca5ed74819d3027bc9926
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10408 bytes
SHA-256: 3ec4be1cb3b95d3de323abf0e76765a8af9595b9507a4508088a25c44c2b0b98

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