Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed75a71f235efb1…

MALICIOUS

PDF

84.6 KB Created: 2021-10-08 17:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4c79ef72681488853051b5f2bc0d2e1 SHA-1: 0053cdb0407cc7ebf8a99634b83262ce0e427a94 SHA-256: 4ed75a71f235efb1d0f30ea6be2d592a30f8585d56edf74f487534f63470a24e
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URIs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior, indicating an attempt to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://texinpack.com/uploadfile/file///2021100613591866.pdf In PDF document text
    • http://consade.com/userfiles/file/10298815920.pdfIn PDF document text
    • https://apra.pl/files/file/segezedelawimopunex.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/64018171331.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/voxutoximefamenofezipevor.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/55463270504.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/sezese.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/92543905025.pdfIn PDF document text
    • http://riph.pl/userfiles/file/mepozibez.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/1253944111.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/80732681953.pdfIn PDF document text
    • http://domosplast.hu/files/file/94396199012.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/tatakijivipiz.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1cgm5g6it6pit1hfkr41rqcr69/zorekisevamamukufukap.pdfIn PDF document text
    • http://davcpundri.com/css/file/94229886760.pdfIn PDF document text
    • https://actorconseil.com/files/file/86612693931.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/79879887110.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/15460019501.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/tafuzogezalawoduguvul.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/54206969785.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/64762425110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=graphing+and+writing+linear+equations+answer+keyPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/66764378017.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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 11248 bytes
SHA-256: 9da4831bcb62ae7739f999844b186e68a6851aadc207ebe1cefc97381ddde5c7
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 19704 bytes
SHA-256: 4ec469890255d5cd03c3cd452ae41838040cfe52fd9d36e34f39174cbb90f866
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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