Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fce65e1a9989226…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 06:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c2e26e4ee76e6ae10757c85970a7e57 SHA-1: d206d97231d7d8e83750da37c70ca5068ff6cb29 SHA-256: 9fce65e1a9989226a62cd5a3c2a7f53e4acaae88f7dd1cbfbfe384f7c438ba0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to what appears to be a link farm, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://startent.ru/SITE/files/editor/file/litomabewaburexidiforegiw.pdf In PDF document text
    • http://kite-surf.sk/files/85547909379.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/lekomiwo.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/vivezugilelasopafaxorep.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/baxudukiroz.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/67602439033.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/befunomirunigukasotunapa.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/77521577873.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/fubumorefosir.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/mamusupigilafabu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27224772891.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/42052401480.pdfIn PDF document text
    • https://aspirans.com/files/file/xevegokazivok.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/7148355252.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/31722147469.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/fimufejogiwapalujukemagow.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/xikoxexekosat.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef1ca32236---11741744346.pdfIn PDF document text
    • https://cmoretv.com/userfiles/61318726052.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091520505172.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/kitinepipumazasukuf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614206dc0bd6f---jikun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adjective+that+starts+with+j+to+describe+a+personPDF 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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 18048 bytes
SHA-256: 9654d1c72f9fb08f026087068b3cce7cfbc8db0245f1af6f00941f20896d0754
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 10968 bytes
SHA-256: 515264652f40ab2717d61f099a8aee988fe3d1cc9dc9e7effc9b576fd90edf8e

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