Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb01427c0c99c06…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 05:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28816fbb3c3580cd41130521ba05b072 SHA-1: 2b68f75e1041ba679ad5ba3cbeb7848422d8eeb5 SHA-256: bdb01427c0c99c0663b85caf239e90f28480f2d76f8286358a4e8509cf3489e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm, indicating malicious intent. The numerous external links suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hantechwelding.com/userfiles/file/2021090700264773499.pdf In PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/luvelevulorikopamubure.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/xelilofoser.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219823994249.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/60266105099.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/69546934121.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/31962452396.pdfIn PDF document text
    • http://erdbau-rauch.at/nedotagozumoxuboxa.pdfIn PDF document text
    • http://novichiha.ru/pic/file/28429657458.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/soxeranemusivid.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/85507780664.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/wetupijepinadug.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/36702613463.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/xirilikezexeramimerawe.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/68295299072.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/puxuvepefowozut.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/77102675816.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/91953912303.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/9933611585.pdfIn PDF document text
    • http://czyxchem.com/upload/files/54549874976.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/4963127880.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/90677714395.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/36825704889.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/bifete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=huuuge+casino+hack+2021PDF 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_off0000b904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 16936 bytes
SHA-256: 376d5596dd346de5af1195bbf238880361a046abd651b8033d19c4102976387a
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10740 bytes
SHA-256: 72c661b4d738ee21b663bed787d9019576928dc94b72bfdae956d7648e7ca378

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