Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9c00a1dfd204e1…

MALICIOUS

PDF

105.4 KB Created: 2021-09-12 04:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9428e32a601ae68f49e90bacf1f89707 SHA-1: 2aa18050df1225b53a1123fe4d014a154afffdf6 SHA-256: af9c00a1dfd204e10965c1046b2ef7d695e55db7bf3ed78e0c084998d3b759bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on distinct, potentially disposable domains, suggesting an attempt to obscure malicious destinations or engage in SEO abuse for traffic redirection. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3572

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://inwebjor.ru/uplcv?utm_term=justice+league+part+two+full+movie PDF link annotation
    • http://voijin.com/userfiles/files/tisare.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/mopatozakizel.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/wakeb.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/41248354427.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/falikawizibiw.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/82049125558.pdfIn PDF document text
    • http://freewest.at/zelomozovejit.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/58168168163.pdfIn PDF document text
    • https://windsbs.biz/files/file/puludebetitoretiba.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/nowidemupukizutokakosusur.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/wulowug.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/53251177652.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/wodumoniv.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/dewego.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/dujikelusubegol.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec15c8db6---4236692644.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/xiwasajolurusunutap.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/475438965.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/kotupijilefazejixejo.pdfIn PDF document text
    • http://carbonelite.ru/file/rororuvok.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/39783311375.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/10787384964.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/19390029807.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_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 10960 bytes
SHA-256: 5c37239c88956da020736442d4e73e90234966355cb61063b65af7857af01569
font_01_sfnt_off0001545f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C71 21252 bytes
SHA-256: 365b757a41fc26451e81d2a69f2c62a316c183095178cc9a0e1016b78eec0cd5

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