Malicious PDF — malware analysis report

Static analysis result for SHA-256 0660296498431435…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 21:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dea97aca6452be1988cc258efe260fe7 SHA-1: 9c952707b1ab5625bd92c4ecc6d22547e33d186a SHA-256: 066029649843143507d3d6c99babfeae483b4e0f75460090aa8aab6fcc665a49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=robbery+bob+hack+apk+download
    • http://domuran.pl/files/file/41277685522.pdf
    • http://www.huntsvillepr.com/files/files/48260865846.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905081109219908.pdf
    • http://pomelieagency.com/userfiles/files/14007963174.pdf
    • http://deauville.ru/files/file/70099414096.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/923432667.pdf
    • https://tatvan.in/userfiles/file/zutiwivodulevup.pdf
    • https://seeyounow.net/userfiles/file/teguxun.pdf
    • http://ultraljud.nu/bild/files/42963401569.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/22307792498.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/48798596542.pdf
    • http://lindseyderence.com/userfiles/files/30975140040.pdf
    • http://asupuro.com/user_data/image/file/12215868419.pdf
    • https://granitabrasive.com/editor_up/33899417865.pdf
    • http://mvpbuilding.com/userfiles/file/sesumumovefarezaw.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/r0al9aa1jksq7s30t8cok05msr/valigosoti.pdf
    • http://dentalclinicbangalore.com/uploads/97905915145.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/93115169742.pdf
    • http://lammermoor.net/imagenes/file/lezobegimidujuruzides.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/35022730657.pdf
    • https://kawanmto.com/contents/files/91579705074.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/lewamutax.pdf
    • https://km2804.com/ckupload/files/38484762809.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98185260247.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86669630377.pdf
    • 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_off0000db23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 16792 bytes
font_01_sfnt_off0000f33a.bin
74b5d14fd105e77981863cfc92d9a1203acb044f0764502b2a41e22c4fa7e200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 10728 bytes
font_02_sfnt_off00010ba7.bin
b944ed76483d4069d76bd25028f9c8bc7bcec0ce2ac9a903c4897857fb0e6940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 17032 bytes

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