Malicious PDF — malware analysis report

Static analysis result for SHA-256 852fe565d3cd88d8…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 17:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22f17acd63f5938be9e81ba76ec05caf SHA-1: e0534876e3c59d48d783fd53c5d01619739c246b SHA-256: 852fe565d3cd88d899115e55546fe877dfceb04afd75aea7a754fa19abfb736d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt designed to trick users into initiating contact with the attackers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://abwninemile.com/uploads/files/80289793825.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/sigotupoxiwuwasapufegipo.pdf
    • https://kujainspectors.com/candyticket/uploads/page_images/files/vuvifabasogonawuxu.pdf
    • http://fkm-lux.by/var/upload/file/54638142815.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a6edcf631---45562144346.pdf
    • http://daydeothe.vn/rich_editor/file/mukexepesepudine.pdf
    • http://duocthientam.com/uploads/ckfinder/files/15632891259.pdf
    • http://kameleonhastanc.hu/files/file/11224356250.pdf
    • http://abhimaninteriors.com/ckfinder/userfiles/files/40680553305.pdf
    • https://yourwebcenter.com/files/file/gifuwoxew.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3da8be5bdf3ee576ac0b1a50fe1bb7bd/pepojevexodivunusi.pdf
    • http://servicedental.it/userfiles/files/pagojisolesanoriru.pdf
    • https://mldom.xyz/web/img/podborky/files/93265860209.pdf
    • http://hb1004.com/userData/board/file/susapidorosewifeninuvaz.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zinomumuduzu.pdf
    • http://gerd-pollak.de/userfiles/file/zixewido.pdf
    • https://pianoinprimopianofestival.com/uploads/file/42992844357.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/vumejimeme.pdf
    • https://la-klamm.org/Files/files/zikasimaxafuxaratimuraf.pdf
    • https://coffotea.com/uploads/files/202109112018153046.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/80267308322.pdf
    • http://st-johnson.com/Uploadfiles/files/bujiwajiwedafosozetibik.pdf
    • http://vit-physio.de/file/72160273208.pdf
    • http://acelybio.com/upload/files/rejademelinovezote.pdf
    • https://nbtele.com/en/cache/fck_files/file/nopepi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=100+in+1+games+for+android+free+download
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b737.bin
a7d88b714d4a3eb1b2345dd7d55fa1995405cabdcb98f4dc218c86e16f90aaca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB737 15032 bytes
font_01_sfnt_off0000dd4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 16792 bytes
font_02_sfnt_off0000f564.bin
c277255e3db8ea4da214604c4f84f3be4a67a13ef7c78af1c8204b874e73a054		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10760 bytes

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