Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dcb3b6483606bf…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 08:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac0a0f9651c288e7b1beab6c05c12a47 SHA-1: 3f11c9fa752d967443973f056e08a24f2adda8a5 SHA-256: 13dcb3b6483606bf7e0499df8b94d0fb811ed1d5f923cfb0514297573b500c91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=60+seconds+and+you+re+hired+pdf PDF link annotation
    • http://biolabsrl.org/userfiles/files/jezurobajajivofubiji.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/50656118355.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/tubunoropogibabume.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/47179526915.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139784d9397c---93931247584.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/posutisogevuwanej.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a84a0581a---77360816690.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///vuxobawozusa.pdfIn PDF document text
    • http://oris-am.com/editor_up/ratagixogarikakut.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/33100622174.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/30390291752.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/26944905363.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/benoguboraluguxafod.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/12204261562.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/pegovujirisavaxakulomogu.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/nerasud.pdfIn PDF document text
    • https://e-midas.ro/files/file/powelefikigumudebokim.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/dalobevilotafagitinibu.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/20990278428.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/89920681722.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/57067080345.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/tizakolikez.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090517033076.pdfIn PDF document text
    • 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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 10980 bytes
SHA-256: 2fa1b9e3b9c11a1c84a87d02013aff1ed3dee88aaa41556d99972957e872df92
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 18408 bytes
SHA-256: 6d541eba008152fef8a0fbcea6366c4812d608317a19c253c7b7341578d43fb1

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