Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b43934acea129fe…

MALICIOUS

PDF

75.4 KB Created: 2021-09-11 09:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 892898991d81c39d3589579990007b24 SHA-1: fabaabe890ab012ecb95d42a83076c38685d2ecb SHA-256: 8b43934acea129fef74c13382d27e3e33d7692a0892b06846bbe6bce32de9032
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and a heuristic firing indicates it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=wrong+turn+8+download+mp4 PDF link annotation
    • http://strandedtattoo.net/file/95166064794.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/fikojetibug.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/85420243730.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/60416474642.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/ramobinugukirerikap.pdfIn PDF document text
    • http://njchemland.com/upload/files/78520198212.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dugalakavevixepudat.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/nupeluzoka.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/gororikudufotemop.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/jonoziwoxumumozaz.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161390768e139c---digodupirozigivowofefoza.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h8go5kc6o2l4qav7pd6gck79m4/zovosorowa.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/31686790411.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/nemunuvalabusepegalugi.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/71694622108.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/60060654856.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/tapomavaxi.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/xovelebukebanipom.pdfIn PDF document text
    • https://thietbigas.net/media/files/pavofizazezaxa.pdfIn PDF document text
    • https://invest.pl/userfiles/file/defixafepomorore.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/29536117153.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 10808 bytes
SHA-256: eae6a5207b1f9bb1e9b773da409b7b1f93b2511be96210f878592e0b07ab1d58
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 17364 bytes
SHA-256: 84c1da5b0ba71c9d8259d71e1712d7e40c2454963030dac0ff53a95800377ccd