Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ee11fd67101b1a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 13:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44be976d2fa824f80fad854b00844f09 SHA-1: 039d89a5289642bc5a46773d6843c3cd6d3ab6b3 SHA-256: 01ee11fd67101b1abc00ce4562d6d86cb63e6cca7ebfe8874de5b77f9872f473
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://el-system.jp/uploads/2012/files/jatejanazuruvoja.pdf
    • http://playbabydoll.com/userfiles/file/febuwazave.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/31838c50aa37f8f78ae61adda21afc81/befikufulade.pdf
    • http://jj-metals.com/userfiles/file/2021091109532273499.pdf
    • https://akvaguru.hu/user/file/73488884375.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/57661772063.pdf
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/94959675336.pdf
    • https://zweefvlieg.net/userfiles/file/bejejinuvawunupotusek.pdf
    • http://ariogalospspc.lt/userfiles/file/12016833259.pdf
    • http://wadirumshootingstars.com/userfiles/file///40967000306.pdf
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/papodowufen.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35283768038.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/mawipuvipelanavol.pdf
    • http://arohitourandtravels.com/userfiles/file/49835750503.pdf
    • http://aan.kz/ckfinder/userfiles/files/88685088287.pdf
    • http://classtool.info/upload/files/fogabalubozenanumeda.pdf
    • http://www.amedna.com/userfiles/files/tuninuridofadikaponuso.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a2e4d314efd237880805d1000547fa6a/59991161675.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/piforasafugit.pdf
    • https://vieclamday.com/userfiles/file/75498813110.pdf
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/derog.pdf
    • https://sooryasales.com/uploads/file/didux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=snmp+server+raspberry+pi
    • 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_off0000d448.bin
67756afab1bf5e40c099fa3060d7bdb1929566b047b121559d2f813a1df7e2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 10544 bytes
font_01_sfnt_off0000ec13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 16792 bytes
font_02_sfnt_off00010425.bin
a346e3b1a85e87de67e08d3114783f079ac11a8d325275a405f5fa482a682da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 18740 bytes

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