Malicious PDF — malware analysis report

Static analysis result for SHA-256 9accc8e8d4f21a0d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 16:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9dcaaff5f70e7d270e5ca26aec678f4 SHA-1: 597604f8a494f05e518d7cf05cd0d35212a06425 SHA-256: 9accc8e8d4f21a0d28fd1602bacca8352f1120613438e66c6709ebbee21f017a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous links pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The embedded URLs and the file's structure suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2832

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://abwmountvernon.com/uploads/files/79513752333.pdf In PDF document text
    • https://carsen.sk/editor_uploads/system/files/vinuwugopilukipu.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/sobixexirirebokupur.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161370e0e9b615---woxusupevupi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/siwupukavilojolojijiba.pdfIn PDF document text
    • http://sun-eko.eu/files/file/rujutirapisojuzepitas.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/85508568754.pdfIn PDF document text
    • http://usagimatur.com/files/others/71446506357.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jemiwuz.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/vufutedawof.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/68466360004.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/37772433701.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zikuxikunisijofuv.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/45010766296.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/neganafat.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/06/fepeka.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/94800174676.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/3302552612.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/38836750593.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388fc66d465---dirumugemada.pdfIn PDF document text
    • http://orderkai.com/uploads/files/56359124364.pdfIn PDF document text
    • http://mosjob.ru/images/file/xisawo.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/43465477327.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/nakawufutet.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/94595062072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=past+simple+of+to+be+exercises+pdfPDF link annotation
    • 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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 16612 bytes
SHA-256: b560f38755fb05324f6cdca743b09060e56040e7fdad925564072a14e0965aa4
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 10920 bytes
SHA-256: b565e60076c73477acf897b3256bd6c664cad57cd71e7403ba0692716acddf04

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