Malicious PDF — malware analysis report

Static analysis result for SHA-256 961f2c9a46c9b539…

MALICIOUS

PDF

55.3 KB Created: 2021-10-01 19:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ce4946b8cee5e0c001997ecb704125de SHA-1: b3d7cd4273444b576f8298dd6e85f7229b0c45a8 SHA-256: 961f2c9a46c9b539a642022e943ef19f187288249a78f9c9a3b67695c004b7ad
124 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains and configured with UTM parameters, strongly suggests a link farm designed to redirect users. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8195

Heuristics 4

  • 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
  • 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://infotechloyalty.com/bot/ckfinder/uf/files/49115776636.pdf In PDF document text
    • http://findacommodity.com/upload/file/26522840941.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/birijatu.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/zumekegimipefinamugi.pdfIn PDF document text
    • https://5uempat.com/contents/files/lixufe.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/fogufek.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/vapesiro.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/20492335241.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/fepawatevubevi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8820d2b5cb54da4e21f00519f4cd255b/98990869966.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/61192208828.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1a6541c2ea9dfa8817b8aa2e4d03b23b/zobitates.pdfIn PDF document text
    • http://puisan.ru/uploads/file/nuxozuroxav.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/35247850405.pdfIn PDF document text
    • http://infracsap.hu/files/file/rexopetakedokuwigug.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/76271186087.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/xodamesadozubigupize.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/xugol.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/71742729929.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/wufujudugadurotegowenagol.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/62632281942.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/sizulatapunoxaliviz.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/65911068487.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/52866824793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rupaul%27s+drag+race+season+10+123moviesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C8 11468 bytes
SHA-256: 5ca0eb60fb33225ac79fb0abdf26ece9897dd0c7dfc96e1c2c0463c309fa5498

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