Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff48bc4b6ed55148…

MALICIOUS

PDF

84.3 KB Created: 2021-03-20 03:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3f7b09e06961c1f734caf3076d3f0f8 SHA-1: 5c6466cfaf6bcd50abca01b3c02d1a4a89cbe3ca SHA-256: ff48bc4b6ed55148895d8d051ea15cc5fbe2e9ea8578c2b703593d1721e70837
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=how+to+measure+cylinder+head+volume PDF link annotation
    • https://cdn.sqhk.co/pajokiman/hhNiihd/best_deals_online_shopping_canada.pdfIn PDF document text
    • http://salestore.pro/70083571791c9lk8.pdfIn PDF document text
    • http://zootime.store/daniwamatagipevealgi.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/RjdGihF/64483732463.pdfIn PDF document text
    • http://olivamebel.com/cml_math_questions_grades_4-_6dij3u.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/RPihhje/89008991613.pdfIn PDF document text
    • http://medicinfo.online/budget_highlightsutf9x.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/jAhdhgX/street_race_fury_game_online_play.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/q6gihj1/nulefijelujigumuwufukidom.pdfIn PDF document text
    • http://ligorowimilupux.22web.org/laws_of_radicals_worksheet.pdfIn PDF document text
    • http://sodalabs.pro/what_does_boast_mean_for_batsoixjq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewuvebasabam.rf.gd/karnofsky_performance_score_ecog.pdfIn PDF document text
    • http://nigugolesaxof.rf.gd/bible_commentary_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe46043d-7f5e-46f2-8a40-6574352c56eb/kedaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cca447e-021b-4588-97e5-c08bb8af7501/tippmann_98_paintball_gun_price.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/march2success_asvab_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/what_are_birds_trying_to_tell_us.pdfIn PDF document text
    • http://xokudofek.epizy.com/67417916891.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/criminal_law_journal_by_all_india_reporter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979faa0a-77f3-4b4a-a860-02b409902217/epson_wf-3640_printer_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/fatixaramopavisuranovome.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_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 5392 bytes
SHA-256: 31d31e324ca8f042046f7c69bf904566f87c77ec5771fabb1abd230672a02f10
font_01_sfnt_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 11708 bytes
SHA-256: 4af957063e80be85c4f0d647e1e68b961b3f239df2362c094a8f6e84c6b95024

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