Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3b134b3acd9761…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 22:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69573586aaafbbfb5572b4bd67694de1 SHA-1: 2745fd92043e804a7a75b1b2e0e23652476bf77c SHA-256: 9c3b134b3acd9761cfa281ccd6bbad80ab1658e1b9712463cdba76c9ba0756f0
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://nomylo.ru/uplcv?utm_term=scary+teacher+download+for+free PDF link annotation
    • https://dennismaloney.ca/upload/editor/file/13167387500.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/72055452844.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/vubito.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/58427627439.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/51744019683.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/zofosivukemojarik.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/gavejebanupavoroguvusan.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/34851564127.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/ziviw.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/90331910642.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93422427046.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/79461119878.pdfIn PDF document text
    • http://nprofit.hk/userfiles/porumovovowozubapimuja.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/34171658322.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/30037784955.pdfIn PDF document text
    • http://rcmo.ru/upload/files/87869056856.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/sinozasuwekofowo.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/24958084613.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379ff6f41f3---32743577969.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/zinewanofitojewofidobedil.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/94324204268.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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 18400 bytes
SHA-256: 3417d6d448dab8a5705a646f5524cef53b7789beb35eda07dce5485183f05a2a
font_01_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 10588 bytes
SHA-256: 7b68a2df685d31b85bba0e0dceddab4662450ccf186a1c5ea6d9a67a14ce0b40
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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