Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5565ea8da42608…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 11:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d38d5042465e03f48f364dcf2cde2e03 SHA-1: 1b51d86edb2e93ac15020ba0de8966356ba1e4ec SHA-256: ed5565ea8da42608b4d6ff69a2f5125d09ca26f74e7c7565a4b8c86e8581c610
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=cual+es+la+version+mas+actual+de+android
    • https://rhuyscampingcar.fr/images/files/wexopenaniratosudevi.pdf
    • https://1877painters.com/FCKeditor/file/suwifinosujopajumi.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16133811024ff0---43265399050.pdf
    • http://liebherr-tr.com/userfiles/file/36994528577.pdf
    • http://olympusflights.com/files/files/xugeto.pdf
    • http://studiotecnicolari.it/userfiles/files/73673272576.pdf
    • http://kibbkw.com/uploads/files/zewig.pdf
    • http://hasadtemizlik.com/upload/file/tonakozabavetexeronito.pdf
    • http://bbfrontedelmare.com/userfiles/files/xunoleganu.pdf
    • http://top-caster.com/userfiles/file/wotuvidemuw.pdf
    • http://jan-fotografie.nl/upload/files/lelubeludogurapulojurizo.pdf
    • http://ipublicity.cz/data/file/4274611637.pdf
    • http://khojedu.net/userfiles/file/tegigukavune.pdf
    • http://top-caster.com/userfiles/file/gifofufet.pdf
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/bizevowilowopirebeja.pdf
    • http://stefanourso.com/public/userfiles/file/gunekefadidifujurimaposi.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/86025978295.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/bumijaporixalebijalosemi.pdf
    • http://laboratoriologos.it/userfiles/files/jilelarozosebapagatonigi.pdf
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/rolivikaserabavoxonixaka.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/43103356019.pdf
    • http://vladjurnalist.ru/archive/file/rojogiminapobanuro.pdf
    • http://moristas.com/userfiles/files/24899933943.pdf
    • http://utcsp.rustyramone.com/uploads/files/43715050271.pdf
    • http://eichler-kammerer.de/doweweg.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_off0000b16d.bin
7dfcf6a46aebee23265f666a99cd800b44133370831076c230744d8408ba9a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB16D 10728 bytes
font_01_sfnt_off0000ca1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 16792 bytes
font_02_sfnt_off0000e230.bin
b2c102d999633c8a09cfe4b686250f0e4c19d2bd5d9e9dc1235f56e5fbd457f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 15228 bytes

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