Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37d19f71771d8f2…

MALICIOUS

PDF

81.7 KB Created: 2021-03-13 16:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb81fd426819f26aab5d27644c348637 SHA-1: 14a3044c24da6066fa0aea828838359beb6301b5 SHA-256: b37d19f71771d8f235208d43a584e31d6ffe85935769861f59e6f90f8fb37516
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure attempting to redirect users to malicious sites.

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://pelibifir.ru/award?keyword=excel+2020+formulas+pdf+download
    • http://bodopeme.iblogger.org/strategy_manager_interview_questions_and_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4368249/normal_6024765367456.pdf
    • http://zakoroxani.22web.org/la_pro_concealer_shade_guide.pdf
    • http://sokokusulamubi.22web.org/subordinating_conjunctions_worksheet_grade_3.pdf
    • https://cdn.sqhk.co/fimirexuf/gcrjagj/womebebip.pdf
    • http://zakofuta.66ghz.com/the_rich_are_getting_richer_and_the_poor_are_getting_poorer_song.pdf
    • https://static.s123-cdn-static.com/uploads/4417998/normal_6008c0b86cd40.pdf
    • https://cdn-cms.f-static.net/uploads/4411483/normal_603b9e84748fc.pdf
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fdb40d3a8b48.pdf
    • https://cdn.sqhk.co/dukizukijire/d6v8rgi/xukuwafivemojozikurip.pdf
    • https://cdn.sqhk.co/belesobikezi/hax65gj/delegation_of_financial_power_rules_2006.pdf
    • https://cdn.sqhk.co/tipefimex/N5Vihhc/exodus_gods_and_kings_watch_online.pdf
    • https://cdn.sqhk.co/sisadenev/iijJwhb/darkness_and_flame_1_bonus_walkthrough.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/50b2593c-5c49-41fc-adfb-7957f589b840/kenwood_fm_dual_bander_tm-v7_manual.pdf
    • http://wiximevisek.epizy.com/angry_birds_1_movie_telugu_dubbed.pdf
    • http://zonefodewev.rf.gd/stay_song_by_alessia_cara.pdf
    • http://rowomasogig.epizy.com/mamevunusota.pdf
    • http://mesepojo.rf.gd/54064078607.pdf
    • http://xozodijavoxovun.epizy.com/when_parking_downhill_in_a_car_with_a_manual_transmission_you_should_park_with_the_transmission_in.pdf
    • https://uploads.strikinglycdn.com/files/d5f45f8d-9e48-43a0-8e0a-8e637fcd2250/12246734128.pdf
    • http://zewipurorafe.epizy.com/capsular_staining_lab_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79b.bin
972d1dc3ffb110850f2ac65aa0f588f9502d75a70948aaf9f2fac10bdbf8d668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 5692 bytes
font_01_sfnt_off0000fb06.bin
7b4b33e690f9ad874b781fb07114c9b18668493510ec88d1f1b61c0c5c97f590		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 11364 bytes
font_02_sfnt_off00012229.bin
461a1578f80084b2f2ca998a6e716936969cc9b33b2976d66eaaa57f6abee57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16172 bytes

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