Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a0d7d605b581a1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 14:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edad54b134927cdc09ce58d486fc4e3b SHA-1: 12dc72bc8c60517ffca5063715c116198f27670e SHA-256: 55a0d7d605b581a19d070cb6c8478aaef33941eaee81e9f5d50bd80016159293
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates the PDF acts as a link farm, hosting numerous distinct URLs, many of which are unknown or suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/99382532343.pdf In PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/piwadenorefipapepabi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f80c7b172163cf3670c6dd5c34e72f9e/mekewijorojivisis.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/wavafarovedevewarifi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/51c2b9738c8a2dc01d88c4c6d7ce8350/zagavojepo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/sivepuradabinafixe.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/97480953783.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/pafowubata.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/23500967296.pdfIn PDF document text
    • http://parentini.it/userfiles/files/makazuzerexixexifemo.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/vugitaxorakudekabosedipav.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/rotedebonazo.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/30485154128.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/nuxinubulimuk.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/90841404580.pdfIn PDF document text
    • https://andrejc.si/files/file/nobejaritebesosivimudazor.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/bakafisuno.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nalefojulivalixo.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/jemudaxe.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tenaja.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/jakoxuzikonuvezuwulesit.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/robamebokabirexoxilogufe.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/61026472308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fifa+20+apk+obb+dataPDF 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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 10392 bytes
SHA-256: a0df98e3da7c8c47fd8502b4b195dfdf1138b400673a10c785b406ae4f74ed57
font_02_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 16968 bytes
SHA-256: 1403a938312d911e7c90b10fbbdcd34492499d6a8853e8c96aa4e3caac7a2532