Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3f9a14eae70631…

MALICIOUS

PDF

62.5 KB Created: 2021-09-26 01:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 33cd6f68f4af8cd18d337780cb917369 SHA-1: 18404311d53025b66df115891f513784e80d1330 SHA-256: 7c3f9a14eae706311d807ede6287f60e83426032526616571e47b79be105a072
94 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, and static analysis reveals it contains numerous external links. A significant heuristic indicates the PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2382

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 http://ricarda-allegra.de/userfiles/file/37230670535.pdf In PDF document text
    • http://pagyesa.org/userfiles/file/20210903031738.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/gitiruzi.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/23979562498.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/jalofujupufuwudupun.pdfIn PDF document text
    • http://qwerty.pl/_data/file/labakixorapokidinul.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/ramulijetipix.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210920104434_Z2FkZXJ1YmFnYWs=.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/tofiwedemariwepojopub.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/funewino.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/begebirozemediweto.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/92878572224.pdfIn PDF document text
    • http://yuli-china.ru/d/files/20561142125.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/12031078420.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/18556056490.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/80950564463.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/fedanofopow.pdfIn PDF document text
    • https://togeltop.net/contents/files/17999629733.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c5e80487---82440855406.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/vofasawalisufu.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/92841247679.pdfIn PDF document text
    • http://wsm.hk/images/files/54493747466.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/guvedasuzot.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nitolejoz.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kanolemil.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zezitikazatabinapun.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/26944905363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+debug+output+to+consolePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 10748 bytes
SHA-256: 78ef916e815fc9aa12315e6770d99107ecd0c8da0b441d6db19c7b02c8472aca