Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd19aa79af9df8c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 10:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf9fc2b29c0193d928f4578d611071bd SHA-1: 7a6b3a4176acc2fb68edda120d2550287af90e1d SHA-256: 7cd19aa79af9df8c71488dcfed3b5fbed15c631b88a78c7c971b69b2c4a0178b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the PDF's primary purpose is to redirect users to potentially harmful websites.

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://infrive.ru/uplcv?utm_term=papa%27s+burgeria+hd+download PDF link annotation
    • http://yeosingol.com/FileData/ckfinder/files/20210910_70E6F7664AAC2E2D.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/sovamobupudigaso.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/20982276357.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/juxefavelimusuju.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/jinetekigubejobubenuzon.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/vapisadogagijuduxulikivoj.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/86745373110.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5673290233.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/18278179062.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/34310904430.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/53661502685.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/posajinunat.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/gezosovuxorowepawi.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tibepuzatupokigimowegon.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/67846986884.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/jagobeledonuvajos.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/fokatebadapa.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210912150307.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f34b7980ea9b3dbf915ae7c6cf7f802b/tarusizufoxovuxibe.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/rozeruwalulupuxugeso.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/6658863804.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/35377637184.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/zores.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/katigapojimokimalazin.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9dd524826---wokalimim.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_off0000b523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB523 10932 bytes
SHA-256: 594155b833c65a78d1b29ead8671f221714c2acc6b14cab363154781b95bdda7
font_01_sfnt_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 16272 bytes
SHA-256: 5349a05893aaded2d9753ee281f61a3a6412fb23116e61da455a3c77585af993
font_02_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1