Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2a566a9e94a498…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 11:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fca33fa47bf05d4a892f48da7858e43 SHA-1: ab490bbe880614b80e9016353dd7071fdc48879d SHA-256: cf2a566a9e94a498cac5ef4843792011757e97338cee2f90141e6f54355e1dcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://whatproperty.ng/ckfinder/userfiles/files/voxovefumoxiritotewiwotu.pdf
    • https://lbk-ingatlan.hu/uploads/file/lozapusodenijewixolapef.pdf
    • https://cowichanseniors.ca/userfiles/file/69768735460.pdf
    • http://videocycling.info/files/file/fekiwajabosowusize.pdf
    • http://toanthinh.vn/webroot/img/files/18662634756.pdf
    • https://chsins.tw/uploads/files/202109141748444533.pdf
    • https://kp-bs.ru/upload/files/74854153876.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4cb9e59411607003cd164f21b18bda47/dazemivurefukomivijugaj.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145cc2aa4178---95511287212.pdf
    • http://studiosiciliani.eu/userfiles/files/1238198766.pdf
    • http://studiochiodo.eu/userfiles/files/wopojokazozejonakibiga.pdf
    • http://arrhythmiaclinic.com/userfiles/file/20210909032724.pdf
    • http://ergakiland.ru/files/files/lajaserotigijeboxawe.pdf
    • http://nguyenthaotech.com/upload/files/dufamisazebebopijadojalib.pdf
    • http://855solution.com/htdocs/cljr/data/files/fideboleravajoxuvukubuw.pdf
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/mimoxofabuxizitibo.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/sozubupukakejerulazo.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/2019458757.pdf
    • http://cahayamimpi1.com/contents/files/48289529668.pdf
    • http://www.sudeshnamaulik.com/fckimages/file/19756746897.pdf
    • http://flapboxes.com/userfiles/files/42691266511.pdf
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/pikemonebenuzenotonin.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/89998324681.pdf
    • http://farmaciafasolis.eu/userfiles/files/vunura.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cinema+app+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7bb.bin
76b788b66b27a5b34be755d05965f6dc9ef99cd87e4d957aef41c46d70abc4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 16880 bytes
font_01_sfnt_off0000e2e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 16792 bytes
font_02_sfnt_off0000faf8.bin
6e2a800e85df1b778c317eb8c7adbcc49633e7a6271cf48e807b85375dfd1687		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 10508 bytes

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