Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fb8fb44ed8185b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 00:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b88fffb52e64378f0f54cd3b4518a25 SHA-1: 7cbf70f950f5551d38cf5257436fb6455c9f8166 SHA-256: 92fb8fb44ed8185b9d7bd5b05136aed2c4cf0d271f516576c9cb245a271563c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a deliberate attempt to create a large number of links on disposable hosting. While no scripts were explicitly extracted, the presence of multiple external links suggests the PDF is designed to redirect users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=lock+screen+time+display+android
    • http://spellenindex.nl/images/uploads/58230971343.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/pawibovunaj.pdf
    • http://enricobarraco.com/files/sasopufomi.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/gurorokeben.pdf
    • http://krasneclanky.cz/uploads/76544567891.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/61a409af9fb3357e7bf3bcebf503f0e4/4572053334.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/mokikoxavofevekuw.pdf
    • http://moje-stranky.eu/userfiles/file/javibijotikipipuz.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3f74351f5---51338504884.pdf
    • https://homecareangels.ca/files/files/files/37824642341.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/68333798837.pdf
    • http://iweldbot.com/ckfinder/pho/files/xasororafogutujepo.pdf
    • http://luchetti.it/userfiles/files/5230758428.pdf
    • http://surveycook.com/upload/tmp/202109/file/revikudunogetilo.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/zafilomiditabevurigu.pdf
    • http://ilksolar.com/Images/Media/files/xuxuguvutonexuzu.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/23478848800.pdf
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35826113489.pdf
    • https://atkarisuli.hu/userfiles/file/93054420152.pdf
    • http://sjzhtchem.com/upload/files/10145283677.pdf
    • https://bmw-zona.ru/uploads/file/12550795948.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/74787692096.pdf
    • https://traffictkt.com/viking1/uploads/files/xomak.pdf
    • http://krajinar.cz/soubory/files/gofukebixejoxogop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af6f.bin
eb780450ed97b504b42e83b20694c1ebccc848b0103c24994256fb41fcd2713a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6F 15468 bytes
font_01_sfnt_off0000d6a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 16792 bytes
font_02_sfnt_off0000eeb9.bin
f0f039dd4bca5c46c36453d37e5fe6e03251a8862fd95aed087c0366e5d9e8f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10840 bytes