Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a74eff7116cb244…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 14:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 452aab7ebfa35fad9bbbd52195b9b2a1 SHA-1: 342317b72b01734e36206ff26ac0bdff6c7a30fc SHA-256: 9a74eff7116cb2445a85cd3132d381dc7763cd9450b802525a948e291ba93930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to PDF files on disposable domains, suggesting it functions as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://millersexpress.com/userfiles/file/pemimuvojufujekifaj.pdf
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/gowivupiraji.pdf
    • http://vititanon.com/user_img/files/bolufukewasaxonimo.pdf
    • https://giaiphapthietke.vn/media/file/files/pidenuvubowawikanigironi.pdf
    • http://infas.cz/images/wiswig/file/65977822428.pdf
    • https://i-intelli.com/ckfinder/userfiles/files/90971208169.pdf
    • http://dhf-china.com/d/files/dokelat.pdf
    • https://iqmuseum.mn/uploads/files/pedodutodimivukosi.pdf
    • https://sedefartphotography.com/resimler/files/zunawejireravuju.pdf
    • http://dioceseofniranam.org/userfiles/file/rujanu.pdf
    • http://elpollopaulino.com/cenavarra_userfiles/files/lipezeni.pdf
    • https://ptogel2.com/contents/files/zabobagotugemunazelatobef.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/29648807645.pdf
    • http://biirbeh.mn/images/content/file/37314944779.pdf
    • http://pfmconsulting.org/survey/userfiles/files/zogafimunamafu.pdf
    • https://tradingphrases.net/userfiles/files/liwuxibadupu.pdf
    • https://cli-kh.com/uploads/files/202109060034423206.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26032966494.pdf
    • http://nesthomes.in/userfiles/file/70264023529.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fabd842e7---73797286105.pdf
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_152042.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=carx+drifting+racing+2
    • 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_off0000cba8.bin
bc7b3d83cff6864c6f6f6a0ba7c0257dbd1ee45b1ce4e9c8bfcabae1c3cbf0a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 21448 bytes
font_01_sfnt_off0001042f.bin
a46e237f360638eb0eeb5e5304ec433626e5d9dcea88fa1ec8085b90082216ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 10440 bytes
font_02_sfnt_off00011bd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 16792 bytes

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