Malicious PDF — malware analysis report

Static analysis result for SHA-256 91171977bc309655…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 09:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 58a33fa5041e7544c7e5c41a2552f3f1 SHA-1: f988aff14ad48d5cf4b75ea9cc7303264e0a8ad4 SHA-256: 91171977bc30965588c5572c33fca338177b88a51c800e77de35e3e58a804774
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting, likely used to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://faurerom.com/userfiles/file/terobuworomu.pdf In PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/mofofazaga.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90304853986.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/jolamipiwuliw.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9dm6tr0o7o73gc0d4c92iag5h6/xilaminimakagatalofujem.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/nafetapotagikidozifuwem.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/babunerode.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/xisovemuvoxetep.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109110630553415.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/24706392010.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/61485638246.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/43523758218.pdfIn PDF document text
    • https://angkagenap.com/contents/files/sasokotolewosigaker.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/zapatibunijuxojitujupopox.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/49608092692.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/gujugagep.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/48678632438.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/19438757204.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/43246025484.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/79290325780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=see+instagram+stories+of+private+accountsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 17876 bytes
SHA-256: 2479821d33dc92785b760587bb4786a2bc8d79a4a8137e91225fc663bd9721da
font_02_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 11020 bytes
SHA-256: fc10af55b542f3c75a2234b6882740063a1c7b51ea470416f9729a160e1973e3

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