Malicious PDF — malware analysis report

Static analysis result for SHA-256 b488c204d821fdec…

MALICIOUS

PDF

90.1 KB Created: 2021-09-09 00:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8d8ae1c7b8ee6bcbdd7907a1cc60044 SHA-1: 73508d558581d510d69cb59f095a1e36fa2f8588 SHA-256: b488c204d821fdec0941be275937f93fa35e3864908c71058f9f4aa11e0105e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to distinct domains. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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 https://philabc.ru/uplcv?utm_term=list+of+harmful+farm+insects PDF link annotation
    • http://csc0535.com/userfiles/file/20210902213102_si3uz9.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/gukopab.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/80188570694.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/didipifidefulowuvileligaj.pdfIn PDF document text
    • http://fitviewer.info/files/file/tifezikejedupoxuka.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/75725447350.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/69260239234.pdfIn PDF document text
    • http://htwy.com/upload/file/towejeliwosikimakifebe.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/4826142764.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/tidasukadubirepanowozo.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/vofusubuzudokuzizawogi.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/77493495625.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/54675879010.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/91729716668.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/mogase.pdfIn PDF document text
    • http://belean.pl/userfiles/file/saxosujoxuzupadode.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/razame.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/kizilij.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/zezebedifeko.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/lutuzomeligenusuzosik.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/medite.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/37251372774.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/faragezalul.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/2490356323.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/75844929286.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xanobimotilupovebukos.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/xewife.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/nugewefixosaraduno.pdfIn 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_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 18048 bytes
SHA-256: e4172a93f1ad93ad918fc982f466209d3991c28a76bbee78ace55020e2204146
font_01_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15143 10656 bytes
SHA-256: d517359e52fed5cccba23d0e5b46f01bf367e076da2ac66159ab0dfbaa40fd21

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