Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6213eda5653fd2a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 17:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e36dc442579ce351048e45dc4755809 SHA-1: 54d00cc8f2e1faa0e22fb1c376d98dac8a3e8db7 SHA-256: a6213eda5653fd2a3ec9db40e4f5ee6f32aeaa00e5d6989dd3b9df6c1c028a59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to other PDF files, indicative of a link farm or content distribution network. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate attempt to manipulate search engine results or distribute content via a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bio-scan.com/userfiles/file/2349237665.pdf
    • http://kodemari.info/data/files/13200559029.pdf
    • https://festival.bg/fckeditorfiles/file/59303527849.pdf
    • http://solemarservizi.it/userfiles/files/zavegakigisize.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146443eeb012---wuwowajubede.pdf
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/guvelujozitowote.pdf
    • http://cosmoscm.com/contents/files/73997916255.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/22480849402.pdf
    • http://cjmfgx.morefriendship.com/upload/files/85096334666.pdf
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/senulibinukezefeba.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/29649618494.pdf
    • http://doubler-son-capital.com/photos/files/27219323832.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e535246cf3---68180450949.pdf
    • http://meadescafe.com/userfiles/file/wowizuzunibusosojirezekot.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/sijefarawixipatuzuzul.pdf
    • http://bobiniauto.com/userfiles/file/12497149569.pdf
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210907221240.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/39328226575.pdf
    • https://biomedchita.ru/imeg_master/file/lovugef.pdf
    • http://notar-frings.de/userfiles/file/relipojavubitivakikisuvov.pdf
    • http://rowadhr.com/app/webroot/upload/files/gegonafufefo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+vr+apps+for+android+to+watch+movies
    • 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_off0000ae8f.bin
ca56a5875cceb14796f3d0c7eec972231e77cde2ff753d3e0bd97b45a28eff8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 15044 bytes
font_01_sfnt_off0000d404.bin
272e9fe67a059109a395d58c5c23d0b30c14fb2cd215130ab81f91dfc7f2c858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 11044 bytes
font_02_sfnt_off0000eda5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 16792 bytes

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