Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b4b2e94483b266…

MALICIOUS

PDF

79.2 KB Created: 2021-04-01 17:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2ed9a1cbed37e5cf7a866dce8049e77f SHA-1: 9ac687c6b8a4dffac6581d816b63fa59b5d93114 SHA-256: 57b4b2e94483b2662aa66ae8b2bef09df2c4864d13e75a3986094a799b03a690
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-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://botokaw.ru/123?utm_term=changing+percent+to+decimal+worksheet+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426557/normal_5fef5538021c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_603c30f84dc8d.pdfIn PDF document text
    • http://jalopava.22web.org/35772390211.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/asatru_incio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_601c61634713d.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/bodybuilding_exercise_schedule.pdfIn PDF document text
    • http://vofufime.mypressonline.com/topurevipokofegosupige.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/47050337002.pdfIn PDF document text
    • http://nunedarozozo.22web.org/anorectal_malformation_journal.pdfIn PDF document text
    • http://mirror-x.org/jelamusaju5scuc.pdfIn PDF document text
    • http://hookup753.fun/how_to_put_rinse_agent_in_ge_dishwasher264ki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504788/normal_5ffd154422404.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/capacitor_104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesufelitam.rf.gd/phet_isotopes_and_atomic_mass_answer_sheet.pdfIn PDF document text
    • http://dukejujegu.epizy.com/us_citizenship_practice_test_questions_and_answers.pdfIn PDF document text
    • http://gunexukod.epizy.com/46104413170.pdfIn PDF document text
    • http://defozuwonig.rf.gd/braun_kf6050wh_brewsense_drip_coffee_maker_manual.pdfIn PDF document text
    • http://minudiginodege.epizy.com/geometric_sequence_worksheets.pdfIn PDF document text
    • http://wabalegawamiraj.rf.gd/how_do_i_make_trivia_fun.pdfIn PDF document text
    • http://debetofewozuri.epizy.com/82534515373.pdfIn PDF document text
    • http://suzebotazolonav.epizy.com/wrong_turn_7_movie_720p.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_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 5548 bytes
SHA-256: 7b43fb5e3bfc7424244cf8912479921ed9747a78fdb35ebbe61c84555a4b12a8
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 11504 bytes
SHA-256: 635e009d23654e16e4121b4f8a83d9ade508e9a76f2098963e8c78f8aee954b2

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