Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba83ec22a152b1f…

MALICIOUS

PDF

87.0 KB Created: 2021-03-14 14:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d273587fe9a3ee66066898f563d0885d SHA-1: 4eb2c1a17932877b0819cb3ca81772b4ff878ebc SHA-256: 5ba83ec22a152b1f802118b4548b528626542c0057590eee4f6723260460f52e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, includes references to 'statistical modeling' and 'wkhtmltopdf', likely serving as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/award?keyword=statistical+modeling+and+computation+kroese+pdf PDF link annotation
    • https://cdn.sqhk.co/neseleko/qififHD/litalotidudotadumis.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/209048.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/network_administrator_duties.pdfIn PDF document text
    • http://4d-5d.com/11376318550wa3jz.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/fepozovij.pdfIn PDF document text
    • https://jutewalezozapon.weebly.com/uploads/1/3/4/0/134016751/5724551.pdfIn PDF document text
    • http://dmgameplan.com/2008_jeep_wrangler_unlimited_enginemfbo0.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/how_to_turn_off_descale_on_cuisinart.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/bruce_lee_kid_age.pdfIn PDF document text
    • http://butalinonoruma.scienceontheweb.net/asterix_em_portugues.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/jfjc4id/child_crash_test_dummy_video_no_seatbelt.pdfIn PDF document text
    • https://ralufuluwifo.weebly.com/uploads/1/3/0/9/130969066/zupalutotoja.pdfIn PDF document text
    • https://lokogupata.weebly.com/uploads/1/3/5/9/135959524/6532730.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/el_mundo_de_sofia_english_subtitles.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/chicco_nextfit_zip_air_rear_facing_height_limit.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/heifZeW/34388881495.pdfIn PDF document text
    • http://pushbiz.fun/2912677419719z3r.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/jhbgfcP/the_sims_mobile_money_cheat_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobebol.onlinewebshop.net/what_is_the_theme_of_letter_from_birmingham_jail.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/new_background_vector_eps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/misurat.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/2111947345.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/74660936936.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/8774704889.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/cuantos_metros_cuadrados_tiene_el_estadio_nacional.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 5640 bytes
SHA-256: 76238a667dfc03c7fd8e9bb9f361f69ce5a3105d9c8fcad89c83ef9819ee95a3
font_01_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 10744 bytes
SHA-256: fa133aee13162e6f28ebb9f2cd098d813a61c4f0b7ccdf89b7204d4cf1d29fad
font_02_sfnt_off000136cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CF 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501