Malicious PDF — malware analysis report

Static analysis result for SHA-256 9771ef75d325d69a…

MALICIOUS

PDF

114.5 KB Created: 2021-04-11 16:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6c01c77271170c80b26de818055b3450 SHA-1: a2e0dab8225de168bee2143790a5e6e11fe458d5 SHA-256: 9771ef75d325d69a910afc70655a8ec65065f076eee3e3af7dec79ae6bfb173a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to audiobooks, aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=wyrd+sisters+audiobook+unabridged PDF link annotation
    • http://health-top.ru/problemas_de_porcentajes_resueltos_1_esoqsbek.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/hhcjdia/88224884701.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/ghjg3Sn/afterburner_oc_scanner_missing.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/BI5NggD/japotidilibegamizejutas.pdfIn PDF document text
    • http://twirlini.com/vulolevudowatamikovupeba7p0oe.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/35408751553.pdfIn PDF document text
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/85816671a45.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/gjaj8ZC/evil_nun_scary_horror_game_adventure_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/RhfhhuM/beard_trimmer_with_vacuum_target.pdfIn PDF document text
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/1190248.pdfIn PDF document text
    • https://cdn.sqhk.co/zigotimuti/cSMgfhd/nonigojoworaso.pdfIn PDF document text
    • https://cdn.sqhk.co/ziveluki/hqjgpid/tisupavenatelamibo.pdfIn PDF document text
    • http://tameeniraq.com/rewuvepaxojibotis71psq.pdfIn PDF document text
    • https://zinenefubodejig.weebly.com/uploads/1/3/4/3/134338026/5289134.pdfIn PDF document text
    • http://healsmall.space/95664232434qya7l.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/yjcmowv/after_effects_birthday_slideshow_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nefomojuwet/movie_er_app_for_laptop.pdfIn PDF document text
    • http://dawejur.atwebpages.com/59584108663.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/choose_file_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/hemisphere_map_worksheet.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/54287847160.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/p5_futaba_palace_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/53873587183.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/libro_fundamentos_de_investigacin_en_psicologa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C41 5160 bytes
SHA-256: 4b18b652912f3fd5f5394c245252884632b60c6bec33a24c36e292d28605c598
font_01_sfnt_off00017df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF1 15324 bytes
SHA-256: 806841130b9771fe85cdecce50728123492f712ecaa5b624cb2eeee3d00ad61a
font_02_sfnt_off0001ae0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE0D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3