Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a2a25e63a51ee7…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 05:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a8f1163102104de8f29b661db6bf726 SHA-1: 156112384b3d2469b0899270ce221bf54ba65d84 SHA-256: a9a2a25e63a51ee710e45c60c9143c37236dd3259e44a64acdb8f4f4762a22f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, with a significant portion hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=briggs+and+stratton+vanguard+9hp+carburetor
    • https://cdn.sqhk.co/lasetipulos/rUhjgcP/disney_getaway_blast_mod_apk.pdf
    • http://panedapupugaxe.22web.org/beauty_and_the_beast_original_story_french.pdf
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/zisolosojewutu_tokogiwofozakan_ratoxew_tivorarib.pdf
    • http://amorexpo.com/525660474884e82o.pdf
    • http://gekolawidope.iblogger.org/45162899096.pdf
    • http://nout-sale.site/marriage_affidavit_format_in_marathigxjch.pdf
    • http://lemiritafuwab.22web.org/88125878910.pdf
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/9396471.pdf
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/sowiposemow.pdf
    • http://jisukiv.iblogger.org/algebraic_fractions_gcse_worksheet.pdf
    • http://rajelakitapeki.iblogger.org/45777938082.pdf
    • http://jofised.iblogger.org/bhojpuri_album_ka_gana_video_hd_ing.pdf
    • https://cdn.sqhk.co/zukivutos/ihjhFoJ/ice_cream_blackpink_dance_tutorial.pdf
    • https://madafodem.weebly.com/uploads/1/3/5/3/135397102/pidavedipofobobem.pdf
    • http://verifiedbadge-lnstagram.com/juvijagejodovu9m2xl.pdf
    • http://hookup153.fun/sar_of_cephalosporinsijotf.pdf
    • https://tunilawogipafex.weebly.com/uploads/1/3/2/8/132814387/wagenilese.pdf
    • https://cdn.sqhk.co/pisupuwov/dwOgiSB/89022224032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kigagositen.epizy.com/hypertonic_hypotonic_and_isotonic_solutions_worksheet.pdf
    • https://s3.amazonaws.com/pukaridimupo/lutibimiteku.pdf
    • https://s3.amazonaws.com/pozokimepe/how_to_solve_division_problems.pdf
    • http://bususetut.epizy.com/invitations_birthday_party_templates.pdf
    • http://bekujefil.epizy.com/hundred_times_100_multiplication_chart.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6c.bin
337693fed935257380a66cbb00dda9e3376b7d7a8360d36af623e5395089715a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 5708 bytes
font_01_sfnt_off0000fed3.bin
eccc8a0c5698802571f5be31b40a23562079ea3f5018ce7be4e6f0e0955bd080		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 10740 bytes

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