Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d5780fb169162b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 21:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbdbc7ed76ceb992b01a3e81cd09eb81 SHA-1: dc3f2364384d481b9262e23867d7594bae6f5bdf SHA-256: 01d5780fb169162b9423af9b681ac7ac0faaed466237c74ef5004424d6c43d7a
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious. Heuristics indicate it contains embedded URLs and is structured as a link farm, with one URL identified as a potential callback phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://inventory-acepipe.com/images/uploads/files/lawagajomevodonumuvovuj.pdf
    • http://hydrogears.com/survey/userfiles/files/82261304002.pdf
    • http://wwsm-us.com/files/file/59087754718.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/xizovitosekatibawadobo.pdf
    • http://acril.ru/ufiles/files/zokajade.pdf
    • http://langeline.com/ckeditor/upload/files/43714869476.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/tomutamezimuvi.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/fejonavadoxobawisavonub.pdf
    • http://fsf-vastroad.com/userfiles/file/bakimotebupetaxotitixedu.pdf
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/nikelawepugunavosulameg.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/fowapipiritexonerupilo.pdf
    • http://sapthagireesyathra.com/userfiles/file/13003813697.pdf
    • http://goldsunjsc.com/upload/files/gelopuxodamumitoxuge.pdf
    • https://ganganagardentist.com/userfiles/file/joxafubalenama.pdf
    • http://lyzjkgm.com/d/files/xojerisudorid.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130339b36b9f---pabipafozeluxuvotitan.pdf
    • https://femagnet.com/upload/edu/article/file/49700791395.pdf
    • http://maristaslardero.es/userfiles/file/74313377632.pdf
    • http://businessvaluationapp.com/fck_files/file/62697341104.pdf
    • http://cjpharmtech.com/upload/files/63587004130.pdf
    • http://rent2day.ca/ci2/userfiles/files/budozebu.pdf
    • http://z-sinpro.com/upload/files/nukebo.pdf
    • http://fueandhair.com/userfiles/files/kamepapebipem.pdf
    • http://khachsansapa.vn/webroot/img/files/wodurutekezadabez.pdf
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/fopezoxigapanokugijim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mod+apk+game+sites
    • 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_off0000c1dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 16792 bytes
font_01_sfnt_off0000d9f3.bin
34fd853e32bcf4a2364c8f3d48de9ce2c667f13527e5b9cb2b8cf6e307ad4017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10572 bytes
font_02_sfnt_off0000f1ee.bin
3786d571c113bebbc89675688301a2cd690fbbf7bd24ecc01ecf98e249aa9252		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 17136 bytes

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