Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d76164ea94ad51…

MALICIOUS

PDF

62.3 KB Created: 2021-09-14 08:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 619294d38456043be792c4c2467c97c0 SHA-1: 6560a6701a73d150b49521450186654d2a179d71 SHA-256: e8d76164ea94ad5177e37ecf46d5a69d206336dc71c733080c80b3996511e156
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8994

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://corporatiegids.nl/uploads/files/8630575591.pdf In PDF document text
    • https://daquin-ferriere.fr/userfiles/file/nutakituz.pdfIn PDF document text
    • http://unseretochter.com/images/file/gakadamofikevutoti.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/52878312347.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/lejilekemijubiweduwajid.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/76257177963.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/sirabeveka.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/xodez.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/88881521832.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/memepaxipodilakusufipare.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/38152045711.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130054b34d9a---24940243749.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/faxizonex.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/rogimuwodefujipasakaza.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/38046736673.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161300e33cf091---14217475504.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/64477123086.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd188815b6---kenejuwakezirudi.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/luvosuvonalusabuxifuva.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/9140361365.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51144672330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=unable+to+locate+android+sdk+flutter+linuxPDF 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_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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