Malicious PDF — malware analysis report

Static analysis result for SHA-256 58394773d8d911dc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 18:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78b13f5dd28fd08f279d9af5923771a8 SHA-1: bdcffaf3dd07f109413e7c17a8fec3a308883599 SHA-256: 58394773d8d911dc3eb9d482c9b855324fc56e3b162e7651df4011b9a7e21d97
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one disguised as a firmware update, suggests a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=yt9216bj+firmware+update PDF link annotation
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/81466388086.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/23120950021.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/9034298586.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da319cb2a7---37389527701.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/nefepatovujo.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109080428293776980m7rc5.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/76224136137.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210902062653.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/ditovebiwesozog.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/54172167376.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/javemi.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/95435599348.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210908234648.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/70867972332.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1f778887---wuwejorajimowegebisad.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/zozugaji.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/52063575117.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/7736379166.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/gizazunogonozaxuz.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/zetitig.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/miwowu.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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 11168 bytes
SHA-256: 86d7a4808739883e7783409b0e6caa45e9bfe89ad044b6019653f5a5413e477e
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 17996 bytes
SHA-256: d80fdc47c8f9d849ad6b6375adfd0d3b251f9951396f3231b5c56d6332d6ebd7
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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