Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad5d9519f68b633…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 14:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13eff01b1cc60c70b306fdbce1d3ed67 SHA-1: c24d8fda403cae4374e63606dc2978f59b06c2aa SHA-256: 6ad5d9519f68b633fbad1656b91fd13421d7285d587656a956574615e588d0f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute content through a network of low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wgadget.com/file_media/file_image/file/fupebuwetodawixus.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/015937d0c9fb3477fb2eb98566f822fc/wowulibizadelowugukile.pdf
    • http://abwmarlboropike.com/uploads/files/63573430239.pdf
    • http://savytrading.com/userfiles/file/muzisunu.pdf
    • http://netisiletisim.com/guvennet/resimlerfiles/naxos.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/54641077272.pdf
    • http://metrocars.london/survey/userfiles/files/78571448875.pdf
    • https://smartcrm.cloud/upload/files/62498795084.pdf
    • http://djk-winkel.de/images/uploads/file/xubopelemodibijenonujulo.pdf
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/45276210020.pdf
    • http://dailygameresult.com/editor/UserFiles2/files/mobazova.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/nexafejakesixegolarixalu.pdf
    • http://synphabase.ch/upload/file/wasajekanezi.pdf
    • http://studionegrelli.it/userfiles/files/92139143634.pdf
    • http://gekon.net/userfiles/file/47278270002.pdf
    • http://miet-boot.ch/images/uploadedimages/file/11272706889.pdf
    • http://refpecsbelvaros.hu/kepek/files/46823554296.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/21225695187.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/mozilapavuged.pdf
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/71725052111.pdf
    • https://sunrise-photon.com/upfiles/editor/files/bebojuxotupefinorakuji.pdf
    • http://avvolodin.ru/upload/file/sokuxi.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0b5c25bca1304ffee2a7dd5ba532e00/simagekebo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=good+psp+emulator
    • 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_off0000c0be.bin
14909a6351e3a7dac020315d71ec4e7b91f58bf7015bff5efb9aed3d4130124f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BE 16548 bytes
font_01_sfnt_off0000eb75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 16792 bytes
font_02_sfnt_off0001038c.bin
ca6b656e122572954211c6903a6576a10b85d77634483c55e895ded5f13c511f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10496 bytes

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