Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a6ffacda740578…

MALICIOUS

PDF

74.5 KB Created: 2021-04-02 08:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 61bc992b7cd29c62273859b224976b35 SHA-1: 0395d19f8783dedd098721e2d373d6e6bafdcc78 SHA-256: 74a6ffacda740578abe74721730a7f32d8088abf035346701edf26c0ca796bf3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to games and application names, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/123?utm_term=most+addictive+offline+android+games PDF link annotation
    • http://megidexabaror.mywebcommunity.org/fituvufigudogufad.pdfIn PDF document text
    • http://olivamebel.com/beats_solo_3_wireless_black_friday_202013dn2.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/31025009300.pdfIn PDF document text
    • http://kalavar.xyz/46880737521ug6cj.pdfIn PDF document text
    • http://you-bestshop.xyz/the_sea_of_monsters_book_quiz640pw.pdfIn PDF document text
    • http://belldiscount.ru/mireratisepolafefemazas725n6.pdfIn PDF document text
    • http://bopepon.22web.org/63835236585.pdfIn PDF document text
    • http://mobile-media.moscow/193861181504vikc.pdfIn PDF document text
    • http://velesvoyage.ru/21377024777cjr3k.pdfIn PDF document text
    • http://igcopyrightforhelps.com/melalowegajub5l8j.pdfIn PDF document text
    • http://wegoradubi.sportsontheweb.net/5222805807.pdfIn PDF document text
    • http://lovelyhouse.online/memorandum_examplest3ats.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/gixawetopoli/how_do_i_control_my_roku_with_alexa.pdfIn PDF document text
    • http://dowirefe.rf.gd/fefejexisami.pdfIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/kesesabaguzamiwaf.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/xuduvevosowot.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/little_sas_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/entry_journal_template_excel.pdfIn PDF document text
    • http://pumakiwidali.rf.gd/guxetani.pdfIn PDF document text
    • http://mizixizomafupez.epizy.com/adhesive_laminate_sheets_for_cabinets_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/arkham_city_dlc.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/cadence_of_hyrule_heart_piece_guide.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/zafibimujileziv.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/when_a_guy_likes_you_but_is_scared.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_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 5408 bytes
SHA-256: 1eb1241aea4326c146a479d3afacd264780a5e5997a116f7261adc623dbfd2ef
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 10188 bytes
SHA-256: cf4d6ef4b740e01b1eb7e2aa68405499f21b368d345af30cd83a60adc8c61732

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