Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d7b154a421084c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 17:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d856bab5ef343d32856e16d663e1e832 SHA-1: 397005d7e80a6f75c523421f15e0b4fa73d7e8e0 SHA-256: b3d7b154a421084c94f920bc5ec545a43daa6fc45e1f433f01a99ae01d96dbd4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an intent to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate it's designed to exploit users through deceptive content or by serving as a gateway to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=comment+rooter+sa+tablette+android+avec+pc PDF link annotation
    • http://imbirimbir.ru/files/31128566244.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/patikojakogofatomexaj.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/sodud.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/kofujotipunufajaxaso.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/juwarimukikusajivusujate.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/47428628109.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/vopotumivid.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16134805ab2678---82769544151.pdfIn PDF document text
    • http://dongphat.net/upload/files/50891723988.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/bofegibexexi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/webabuxedazonufifezevum.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/20465743622.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/kalokobuseb.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/feziwipalawuzodufofa.pdfIn PDF document text
    • http://htwy.com/upload/file/bilozijodosatenimuwaju.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/jufujogovajizagajutimive.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/35087704006.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/toximafaxakutafakuxabob.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/89571644905.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090619584073499.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/12791634366.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/madovati.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137158a2f9cd---44748007733.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_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 18804 bytes
SHA-256: c8156cda8b5b317854393929a93879338d171526eef9fa365aa5277674e43bce
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10912 bytes
SHA-256: f2a623218f73e9c5f872e41d2a2cc6535635fd78b1db861f57ac3cc99cbec297
font_02_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1