Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b05e86a405cf5ae…

MALICIOUS

PDF

77.2 KB Created: 2021-09-15 20:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73c4bed3bc60940d99f218d19c46d9d8 SHA-1: d5cc8866787311d71d8763a8f735256f0adbcfe3 SHA-256: 2b05e86a405cf5ae75d2cf5f0f4db94d3c82233ca3114fe731e7dd71109ac2cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=100+doors+apk
    • http://seidels-mineralienwelt.de/images/uploaded/file/vubifok.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/wexos.pdf
    • http://internet-trade.eu/UserFiles/file/49797238840.pdf
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/xosazituv.pdf
    • http://telecycling.org/files/file/mifito.pdf
    • http://tichdiem.surecare.vn/uploads/userfiles/file/94746611547.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/60793110974.pdf
    • http://888chji.com/userfiles/files/xuniwinikedumexizomepe.pdf
    • https://tp-pos.com/uploads/image/files/18442194176.pdf
    • https://damsindia.org/admin/uploads/file/8292984359.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/xenef.pdf
    • https://zaragozadenoche.es/upload/files/fofax.pdf
    • http://mini-garden.ru/userfiles/file/71151423017.pdf
    • http://maimungkorn.com/UserFiles/file/vimadezipimizenejugotaz.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/jemegipegezuxibaw.pdf
    • https://its-bulgaria.bg/files/file/68003895938.pdf
    • http://gruppocreta.com/userfiles/files/27811450153.pdf
    • https://htcpost.vn/vietpost.vn/img_content/file/37350935889.pdf
    • http://modernplating.com/userfiles/file/lajixugokoxugizanela.pdf
    • https://jotelek.hu/files/file/pazukevuwerobodosa.pdf
    • http://netcentricnj.com/ckfinder/userfiles/files/vuxoxewutaxomiwe.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9794436470.pdf
    • http://murielbellhomes.com/userfiles/files/21642396443.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130303319b1b---xenopogofozojaj.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_off0000cabc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 16792 bytes
font_01_sfnt_off0000e2d3.bin
58db891282f5d4aa1ef576f6d88129c68cdbb73e4f0ca4d09f3fb768d3df1208		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 10080 bytes
font_02_sfnt_off0000f959.bin
10ab23b72d5f9de16c166b323da8bc400ea9eade8e3c9fd6b32a191ce5c7c8d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 17960 bytes

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