Malicious PDF — malware analysis report

Static analysis result for SHA-256 50265e81af70432e…

MALICIOUS

PDF

83.7 KB Created: 2021-04-06 04:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 458020b4d701ad55777e3ca635ebafc2 SHA-1: 8b009c629097da9647262fc767b5824e0d318bdd SHA-256: 50265e81af70432e1b71dc2dfaf80ca7d0e48ec6a3ec257fa4c4642e6f30de67
186 Risk Score

Malware Insights

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

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 0.9993

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://dafemum.ru/123?utm_term=dota+2+comic+hero+wars+guide PDF link annotation
    • https://cdn.sqhk.co/kuvapipitol/RBwLMdX/badusha_song_ringtone.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/kgijeh9/bekafugegoradozerav.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/7hdDibR/pimifobopepeta.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/hjG4Rdz/barred_spiral_galaxy_names.pdfIn PDF document text
    • http://geforiro.scienceontheweb.net/78156159527.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/ncert_maths_class_11_solutions_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/Cjgkphi/synesthesia_definition_in_art.pdfIn PDF document text
    • https://cdn.sqhk.co/gixobujikelu/BibhjC4/lord_of_rock_bands_ever.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/i0Bmvhg/green_wheelie_bike_seat.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/boxujavuzunesopo.pdfIn PDF document text
    • https://cdn.sqhk.co/fonizijodi/eDib7jd/fisabotiruziku.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/rebofanegenodogize.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/jg5mhaN/ruseken.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/WiajBgc/pasafagoroxizijag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofideb.onlinewebshop.net/wefefivaberirenoxexabi.pdfIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/pejuzesaloleraver.pdfIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_273623a1bd8d4e25894a1b2a82af25b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojenozap/50249008594.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/pidewazafezegemaduwib.pdfIn PDF document text
    • http://xirofapinowud.atwebpages.com/8_stages_of_counselling_process.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/heil_furnace_model_number_breakdown.pdfIn PDF document text
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_638ebcd1cc954a77919f3489acc12ddf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/video_twitter_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/71488114495.pdfIn PDF document text
    • http://jugugesazo.myartsonline.com/balancing_redox_reactions_by_half_reaction_method.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_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 5544 bytes
SHA-256: 273cfbbd71e3a9d81d37c7d6f9f7b4abe7b23ab818ff241bba98e984a47fd25e
font_01_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 15628 bytes
SHA-256: da578e141f230c9592c72b2cb2f3bf6feef0923359d4f7ba87d97f94877cc3c9