Malicious PDF — malware analysis report

Static analysis result for SHA-256 442185d569c20b84…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 07:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94456dda509dfbbbe29c4bbd8a994217 SHA-1: 2a21fec319f64dd0bf69a806e55c3123ed34d366 SHA-256: 442185d569c20b842da743dd230aa5294e7c6ec735478dbc1815da20df6374ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://rusepress.com/uploads/wysiwyg/files/38654427042.pdf In PDF document text
    • http://summitremodelinginc.com/userfiles/files/66706778870.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/71340328540.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/fikevekifeposoba.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/sujogutoba.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/25241226966.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/gofepexevizobobezageroza.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc0088f3b---baxinisukadodip.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/87954502903.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/43370624424.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/xutitubinuxa.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/nisagesiwugowirefoja.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/povekukozubet.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/retow.pdfIn PDF document text
    • http://parilka.by/var/upload/file/80662429794.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/65019575126.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/11571542824.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/kipeminariwusutufekamat.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/mesino.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/deramogedozafebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=add+watermark+to+video+android+programmaticallyPDF link annotation
    • 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_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 11028 bytes
SHA-256: 190e2777f7259752786d23cb5885235a73cdf08bebb3ff90a2f0d45e19d20304
font_01_sfnt_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 16892 bytes
SHA-256: 9b47761f142910966a3cb692eaaf9f8cca3c7c49e52ae9f7350b4ebd9a6141e7
font_02_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.