Malicious PDF — malware analysis report

Static analysis result for SHA-256 29559c76d5040dc2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 12:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2bee057a66456c04f44a8456620b8cf9 SHA-1: 3d77a89b5da3f10e4fdac8427ee82d5b81dcb8fe SHA-256: 29559c76d5040dc2efe888b5fb0cea98de12a779141b3b092d1588fc5fcff536
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous links to external PDF files, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this, aiming to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sydjpg.com/images/upload/file/20210909_205711_124.pdf In PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/83627790452.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/pifati.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/nanumukosujatirefo.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/81774705418.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/72159468953.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/jubivepuwovumomo.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016113594.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/91185894497.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/durapunawagu.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/lelatefakewizamat.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/logetobonenotusobejerunal.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/kavogararebepunusej.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210905_B2BCD6699960D78B.pdfIn PDF document text
    • https://festacontinua.it/public/file/72808868627.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/mujigimut.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/posaresugijesafokeviboga.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/gamanibasapijese.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/mukakizajirexunepagon.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wezobus.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zoxanesupiwavokigurok.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/39413326502.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/2471440029.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/26996993365.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/55111142886.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/zoparofekazepogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=treasure+island+pdf+downloadPDF 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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 17100 bytes
SHA-256: 5d3f8e38a011ddf6586ac60a0b054fbc44ca95d6c734d023d4fffd99d562f4cd
font_02_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 10544 bytes
SHA-256: ca7d7f7b6f236dbaff8b47ec959af359bdba6333c5d597f658a93a1e14b83019