Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c700701a239d68d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 07:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f5240903641fcbc3df9d09b33dd41ca SHA-1: 20b1f96543ba812f8e6adfbed89629abe3470219 SHA-256: 6c700701a239d68df2c11171936a32a2b3ece18dfaaf67a4b0afd0ba4b4c9168
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many of which are associated with link farms or unknown reputations, suggests the PDF is designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sireny.net/share/files/vefivimadal.pdf In PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/nilag.pdfIn PDF document text
    • https://yifff.se/userfiles/file/1312287946.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/toxomivez.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/22438043007.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/19692367981.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibarisinixubirapixofa.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/73274490764.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/mowarulovurelanoxem.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/nuzikoroxi.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/28944964269.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/90061871674.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xanewasefejurojej.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/xijofuse.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/42778923903.pdfIn PDF document text
    • http://husplaza.hu/editor_up/26048384997.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/pipabazilajomirusu.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109131131585643.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/revekosipubako.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/wasizusereg.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161371a0e0395d---falugodetesujoveseninon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=8+pool+hack+gamePDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/fevajuvopabizis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 16708 bytes
SHA-256: 0b14540585ed1ed63bed7f39f3c15695ff607b0d140cf61069b5b253f4c8422d
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 10460 bytes
SHA-256: 552ad3044773a0463c3747c9652cb4fee84340c45c827943a00df5af3208b680
font_02_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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