Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d12e7cb5f12147…

MALICIOUS

PDF

77.2 KB Created: 2021-10-01 08:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abee52c3dfcf7e6dc2fc41dec8ee64fc SHA-1: 3f9c4394bc8f1c5eaec5781020cce6d86d4ee817 SHA-256: f0d12e7cb5f121476a959a8540ad11f3717267b70ac2817a0e92652ed23a6e20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no executable scripts were extracted, the PDF structure and numerous external links suggest an intent to redirect users to potentially malicious sites. The presence of embedded URLs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://investbuild.ru/var/upload/file/22606051981.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/76570928864.pdf
    • http://pixel-pro.ru/upload/file/26739151904.pdf
    • https://skatrip.com/basefile/skatripcom/files/wudikuzikipazidividu.pdf
    • http://yoron.net/up/files/96429381369.pdf
    • https://oazapiekna.com/zdjecia/fck/file/sepexe.pdf
    • https://fereshtegan.net/basefile/fereshtegannet/files/21070087268.pdf
    • http://dorp.pl/userfiles/files/tetefelajo.pdf
    • http://lawfirm.vn/MINH/user_files/file/nazasubit.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/38097099945.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/xedevutito.pdf
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/mufipokorajuvupomevedin.pdf
    • http://bordahusfeldolgozo.hu/editor_up/28980471658.pdf
    • http://sumtinathholidays.com/admin/uploadfiles/file/xojekolivi.pdf
    • https://lee-trading.tw/archive/upload/files/47241131354.pdf
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60368791099.pdf
    • http://whatcanidoforyou.eu/publish/file/gemivexavafixolitegixo.pdf
    • http://selidbe-beograd.info/files/7814362627.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161319db1ad90a---19192499982.pdf
    • https://dusunceokulu.net/resimler/files/60309977368.pdf
    • https://salonrewards.ca/images/file/86094480670.pdf
    • http://geombiagioschettino.eu/userfiles/files/14520759344.pdf
    • http://jfac.kr/ckfinder/userfiles/files/41621944954.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/575f03920525d992fa9aa51b2c952971/fokumakub.pdf
    • http://unixsensor.com/uploads/files/202109100128353624.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/64572001857.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=present+perfect+reading+comprehension+exercises
    • 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_off0000c33e.bin
760fe38005ed752db847fdf35fc7fef6bf3251781b9a5f27795e98cf107f027a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC33E 18988 bytes
font_01_sfnt_off0000f4b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 16792 bytes
font_02_sfnt_off00010cc8.bin
e006b473cafd9e713e88ccdb36fe3a330c1dd8b5ccaf36254d762067222f6895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 11124 bytes

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