Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac6a72c88fe4014…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 10:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87212406e0abe8ca64956db93ff60121 SHA-1: 83231a7820ef50ac06fc12c7c9c0e665cbca6f5e SHA-256: 9ac6a72c88fe40143390e6bbbdb210ed0c58907ae320127f7b86964e3bc869f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, with one identified as part of a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious external sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://liddellgaryfamily.com/clients/863293/File/batisudobawiwa.pdf In PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/84804845003.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/jifuputawududunulux.pdfIn PDF document text
    • https://asken.as/bilder/file/kofebuba.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/5557392345.pdfIn PDF document text
    • https://latework.cz/soubory/gotar.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b643ed35cad---20911283359.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/53002577791.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/81638715707.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/67315501626.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/46229507426.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c92c856f38a---jinikekixogimituvokegeka.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/49905451918.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/razogegupadezixugesu.pdfIn PDF document text
    • http://lobi.md/userfiles/file/93350894026.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/64460761390.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/japelovilugasosunofipet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=convertir+de+pdf+a+word+ocr+onlinePDF 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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 18700 bytes
SHA-256: e75993b928ae81907add8f14f9b155441277378a540d62cec34ea194c077c288
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 10628 bytes
SHA-256: b09fba0b0cebaefde67df0d9609eeb11d8ca680c08b673c0d1c971b1cb1bc43f

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