Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b99e8ac3c81ae74…

MALICIOUS

PDF

89.1 KB Created: 2021-09-11 23:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9359b50439e23ff4bcdf1ecde3e8ae96 SHA-1: f4f2239fd4e3bf9c84d5b74b934593c560a7189c SHA-256: 7b99e8ac3c81ae740622bf2284718fc74ce3c65fe212918a772fc99eb71afb99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV and an ML classifier as malicious, indicating it likely contains malicious content. The presence of numerous external links, some pointing to domains that appear to be part of a link farm, suggests a phishing or redirection attempt. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a tactic to obscure the true destination or host malicious content on less reputable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bolshunoff.ru/images/wysiwyg/file/79525069581.pdf In PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/jogemiwaz.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/sunenamuli.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/69443862300.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/zonavevinikiw.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/siziwivixikilepewerimitor.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/89556909642.pdfIn PDF document text
    • https://oasis-travel.ro/files/74132916423.pdfIn PDF document text
    • http://colegiumaniucarei.ro/ckfinder/userfiles/files/gojixewosum.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/1483652226.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/14517235773.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210905081921.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/biwedufonilagakogoniw.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/92115620761.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a1f44c5d---gibuba.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fufavozedinurelukosuw.pdfIn PDF document text
    • https://clinicscrm.com/img/files/lidilaxisobovewevudizatam.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/48361394986.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312595093ce---xelimenemasodes.pdfIn PDF document text
    • http://chapelguild.com/images/usr/98292128575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=add+music+to+voice+mod+apkPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/49042072056.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_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 19756 bytes
SHA-256: 6422b4fca9a90848cea19577d4d191ad628ac6e28cacafeb17e4b0e128367083
font_01_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E58 10664 bytes
SHA-256: d4dfef55fdff5278c734544351f3fa9696390405aaa04e1274fd709b9841797b

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