Malicious PDF — malware analysis report

Static analysis result for SHA-256 450b3ac2faf14214…

MALICIOUS

PDF

101.6 KB Created: 2021-10-07 03:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03e89f3ef9aadfc676720681404b87e8 SHA-1: c334a1edef2f7099c8cd25fd1d39abce897b2aa7 SHA-256: 450b3ac2faf14214375b942794089d14f2179d9e2991711369e43a29f47a92eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=can+you+pull+a+muscle+near+your+ribs PDF link annotation
    • http://meuble-tunisie.com/userfiles/file/5414057106.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/93984680286.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/96613277857.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/15597147133.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/rikalasipaxabo.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/41992636736.pdfIn PDF document text
    • http://tabletopad.com/images/file/gumizavexunolemegelowiji.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/53084885279.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/71241671094.pdfIn PDF document text
    • http://belniig.by/public/file/89059981226.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/favululajozotapiputuxum.pdfIn PDF document text
    • http://slsnn.ru/content/files/xazefiveselaz.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/25869705659.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/seduvizufufewegejizavofe.pdfIn PDF document text
    • http://linker-apps.com/files/bugulajodamuxo.pdfIn PDF document text
    • http://cci.dboem.com/js/upload/ckfinder/files/89902839575.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/38201937062.pdfIn PDF document text
    • http://xfswchem.com/upload/files/93647973095.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gomopazuridowugaxagaj.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/wefavupajopoma.pdfIn PDF document text
    • https://nexusmediation.nl/files/3011088187.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/52076429133.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/33082051072.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/30150887223.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_off000128a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BB 18272 bytes
SHA-256: 9330910a29114e6d648d6dbac200cb486fa86acab4a6e7b4f38d10e88bdcac69
font_02_sfnt_off00016ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF3 10820 bytes
SHA-256: efdd1defa4d09ac2948bbb0c0d6cbbfd6597ed2ea5cd09a44abc5b5b2ffafc2a

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