Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f50477bfab5dc1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 20:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 106233b609d678947dd8d743d08b2e2f SHA-1: 7917a27bdd3ecf36818b74dc2de3b19e1a88eba9 SHA-256: d8f50477bfab5dc17588d514a303da50b57a7524a83dd6fe031737e96b575386
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The presence of these links suggests an attempt to direct users to external resources, likely for malicious purposes such as SEO poisoning or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7380

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://bilafafafa.com/shopadmin/upload/files/66091701492.pdf In PDF document text
    • http://www.europesolidaire.eu/userfiles/files/ninigu.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/48495316969.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42968993596.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b204c29d---85585104901.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/lusolirumupivujuzigivow.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/32639225824.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/vobesilulaririwajubinalag.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gabivotukivigek.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/zazibopazaxumudikaso.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/99400467109.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/susawilibuvetenika.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/52834260365.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/44542876861.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139becf2b8e4---41355789691.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/gibufi.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wativorixaxoledo.pdfIn PDF document text
    • https://noglehoma.com/ckeditor/files/files/16430611456.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210918_8128A1A09A8DA530.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/zajov.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/8610900766.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/lunitotukevelasunokuk.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/sotitisadowit.pdfIn PDF document text
    • http://medrea.ru/upload/files/wamuki.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/85842660549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=accumulator+pdf+creator+apkPDF 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_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 10592 bytes
SHA-256: a132bbc3d26f091c08104126c8cfda6ae967f34136ecc9575174986c827d640b
font_02_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 20060 bytes
SHA-256: 8de5daa2b6e0fa69effc7865b1db9fe410f5e0cc5b4d288f0332cb9305511b70

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