Malicious PDF — malware analysis report

Static analysis result for SHA-256 817c43db298d689a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 19:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f26ca772d8e46c39518e2e615a18ed16 SHA-1: 03a4913e0b6fcde13fefb347dcfe8f164bc8da96 SHA-256: 817c43db298d689a3522e17ef6fdaf3a31cbb56f23416be750e1abb4c2ff189f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting and UTM parameters, common in phishing or spam campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e66837f67---27252755766.pdf
    • http://usefchina.com/uploadfile/file///2021091207224339.pdf
    • http://lpc2529.com/piceditor/file/35137397030.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/vuvufesozumi.pdf
    • http://palestraarkadia.it/userfiles/files/67634015290.pdf
    • https://konyaalotaksi.com/userfiles/file/87393769571.pdf
    • http://7seapharmtech.com/Uploadfiles/files/60182909380.pdf
    • https://gilboamedia.com/userfiles/file/bologonokajijuvo.pdf
    • http://travelcenterpuntos.com/campannas/file/22302415269.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf602973c0---26866559027.pdf
    • http://bulk-supplies.com/userfiles/file/82963619796.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/moravujafupi.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/rogubi.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/punep.pdf
    • https://zohopin.com/calisma2/files/uploads/mifubum.pdf
    • https://agri-mal.pl/userfiles/file/41294304503.pdf
    • http://watdoenwevandaag.nl/upload/48458122799.pdf
    • http://tongshengchem.com/ckfinder/userfiles/files/sitamapirojofedaxor.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/34224581809.pdf
    • https://louvre.lv/res/wysiwyg/file/temes.pdf
    • https://adamslakeband.org/userfiles/file/xodinelabi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=weed+firm+mod+apk+unlimited+money
    • 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_off0000dcd7.bin
45cb6d88c959f066667ef09e969aa93def03c027011ed880ac0198ad19c8a406		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 10792 bytes
font_01_sfnt_off0000f5ab.bin
8f8cf2b1c6c18c9d26c5402312c57922e8f00628d9231e489a283292c345ff28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 17976 bytes
font_02_sfnt_off000124a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 16792 bytes

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