Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34affb3e0bd2c5a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 00:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 955d9037d7208303acdbfcaa4bda69d4 SHA-1: 2a3fb737d689ac2ffe27e3cd68e78ba68e3bd2dc SHA-256: f34affb3e0bd2c5a7ddd015d05bd712bd7ade4af7d76e74b3cb43988c068c69f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to PDF files on various domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for obfuscation or rapid deployment of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sanghvicranes.com/staging/media/74220758581.pdf In PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/dejadixazemapaxi.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/popubemew.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2cd013cbea4d421f07500ffecd4f0108/nonuzutoduwiwikobutek.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/varevedu.pdfIn PDF document text
    • https://akemi.ro/hirek/file/60445413635.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/75903471891.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/nonakakikeguner.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/72785525145.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/xugegabodekovubu.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/2581705681.pdfIn PDF document text
    • http://kccmaul.com/files/files/24444942476.pdfIn PDF document text
    • http://potya.com/lifibudineramo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd15b7e09b---zegudukatobusuk.pdfIn PDF document text
    • http://precisao.org/files/files/24947649319.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/warujuzobijawakakasabod.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/5768649534.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/81164256325.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/37630170667.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/tolususavefume.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/54615977339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=i+am+the+night+season+1+episode+1+watch+onlinePDF link annotation
    • 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_off0000af71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF71 16304 bytes
SHA-256: 1010440c9ce91a992710bd1ef8151e1e8e7b0f7da118530c6005fb0ab6b668b1
font_01_sfnt_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 10948 bytes
SHA-256: 1128ea62fbb32aa93c0d659b098dd34cd1583abbce55d93f47973db52ab13c97
font_02_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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