Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7efddae41fbfe7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 03:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3711a28178b5f35737a5a23ac61a6c6 SHA-1: 9d4aa130d714a4ea4e4cea953c11ae5bb497a995 SHA-256: 8f7efddae41fbfe7136d10c60fe8a85fe5db91f6f3887e9bb4a75b7890380313
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bjavc.com/filespath/files/20210909230639.pdf In PDF document text
    • http://lagrupacio.cat/file/muvaxakapurerij.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/rosapavujiku.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mewezajivosupazumisawuw.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fopifulidizonex.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613148736ca7e---vusavejafate.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/vajonudosorolape.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/75576116583.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/zuzasozanogovini.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/nefajimo.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/naxugaza.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sedaburodakiliwulodal.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/zasedonaniruve.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/13422803610.pdfIn PDF document text
    • http://alcantara.cz/data/file/lafogolomobu.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/7944882164.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/72634889836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+check+who+has+stalked+you+on+instagramPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 17276 bytes
SHA-256: c9a7da5d9fb04986ade8dfaddcc69a3362026652610924d104219bedb8bbfd64
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 11200 bytes
SHA-256: dae3ff5754f3abc344bf39e39c2d21f59988d753849995d6e0280db9c92f3409
font_02_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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