Malicious PDF — malware analysis report

Static analysis result for SHA-256 934867adf52e6411…

MALICIOUS

PDF

87.7 KB Created: 2021-09-09 15:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42324c097aa15a1240f118dcf521c308 SHA-1: 66f84e1cc43988f601e854a9fe1d49ad63cb052b SHA-256: 934867adf52e6411267faa6799d0792a26a257d0e6f567f351d2d2abe46f255a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a specific ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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
  • 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://signika.pl/Upload/file/9909419629.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/zowebilutagepunifibe.pdf
    • http://gsprojekt.eu/userfiles/files/suvezuz.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210907175048.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/8168131958.pdf
    • http://dges.in/userfiles/file/subojufuvo.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5e619285---kizun.pdf
    • http://yyfxsw.com/upload/files/pavenige.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/julajane.pdf
    • https://tonymusic.se/UserFiles/files/bekoxa.pdf
    • http://zulaikhatextile.com/userfiles/files/54119379789.pdf
    • http://www.depomatrial.com/file/raxuxulakibijek.pdf
    • https://futurefacesmiami.com/uploads/file/delurowewu.pdf
    • https://samowar.me/userfiles/files/3859304149.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/dakiteviroxitafakegami.pdf
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/52798440468.pdf
    • http://radecznica.pl/userfiles/file/41005292887.pdf
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/wavakemivofarujewi.pdf
    • https://ubk-sad.de/azubi/userfiles/files/75674354324.pdf
    • http://eska-lift.ru/userfiles/file/jijiwevegesufan.pdf
    • http://speckletrack.com/update/editor/file/68605792588.pdf
    • http://unipsyclinic.com/userfiles/file/20210902211409.pdf
    • http://motolargo.pl/userfiles/file/vonelajefegumuladikemupap.pdf
    • http://controldellaves.com/app/webroot/arxius/file/taxunuwekapo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+developer+docs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
font_01_sfnt_off00010b35.bin
845fa421c282117eca67d4c8498a0b0585c4374db924a4a2f7a1db940a5f1de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 10296 bytes
font_02_sfnt_off0001226f.bin
d7377f04415d6bd07433deece6f5d6b95308dc595e904cbef2beaabafd0ccca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 17684 bytes

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