Malicious PDF — malware analysis report

Static analysis result for SHA-256 521e00e2a6653d60…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 10:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff3dd32a4b56bb64ba326cb33cd5a96c SHA-1: f93ccf307e28ebb98862404d9fa6abd833a14674 SHA-256: 521e00e2a6653d60c537be30054ee986ad3f59122f959e803fb279f6d4f477ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection strongly indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/wofewojapejalos.pdf
    • https://organicfertilizerproduction.com/d/files/lufamazonixomanavaloropex.pdf
    • http://pwharrison.com/userfiles/file/30515675439.pdf
    • http://0932018255.kad.tw/kads/ckfinder/userfiles/files/77614495407.pdf
    • http://bouwbedrijfbouwheer.nl/userfiles/file/jipugijemewijawimixonero.pdf
    • https://pcetravel.com/files/file/37163591628.pdf
    • http://quesnelbusinessnetwork.ca/userfiles/file/55451718974.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/bexitikuratalozafoluzo.pdf
    • http://prtourusa.com/FileData/ckfinder/files/20210913_F5614ED052EE33A8.pdf
    • https://www.almuhja.com/ckfinder/userfiles/files/puseba.pdf
    • http://ibrahimalsada.com/pics/file/latowefokilopiwofom.pdf
    • http://mgocsm.in/userfiles/file/paxidamipobot.pdf
    • http://stopguepes72.fr/userfiles/file/88274207899.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d78ab934682de42f30a89777bebf2429/gizozodaj.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210921203406.pdf
    • http://bkm-market.net/userfiles/file/82716857530.pdf
    • http://asea-admin.com/_userfiles/file/20210909193617.pdf
    • https://armenia4d.com/contents/files/2614940990.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/xokekarovegedakunamoj.pdf
    • https://callmarkinvestments.fortunekenya.com/callmark/files/mukuwug.pdf
    • https://rkdestate.com/userfiles/file/zagewelobewipa.pdf
    • https://www.bosingels.nl/ckfinder/userfiles/files/94302556339.pdf
    • http://dd-eng.com/files/files/xuwasi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hello+neighbor+hide+and+seek+beta+apk+download
    • 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_off0000c2b6.bin
c94af56bf3864aa266a35a4ae2b109a8f50fc7c4659acd8c4dae4a2d2ed28788		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 10980 bytes
font_01_sfnt_off0000dbb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
font_02_sfnt_off0000f3c7.bin
16945e38653892b67a6f090c6670b04578e950506fbc417154ae9764d7e02e69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 18024 bytes

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