Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25c1f2fe1efdf84…

MALICIOUS

PDF

69.8 KB Created: 2021-09-11 08:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44cdd32c84ea085a1847d193685b5acd SHA-1: 90d7f1ee9f1d15804e62ffc45db384afd2a9317c SHA-256: e25c1f2fe1efdf844127b4968c4bea8ec6cde5351cc88d656f04b1fdd241a91a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' in a URL suggest a phishing or scam attempt to drive traffic to potentially malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing document.

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=plants+vs+zombies+1+hack+download PDF link annotation
    • http://venkateshservices.com/uploads/40671345240.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/80012599269.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/67011135172.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/15263057616.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/bivadojobemifivikeza.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/50309679246.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/wadofizaz.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/14320940878.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f077874371---33619556670.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/1223443571.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/13342520470.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/sisamor.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/gomagi.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/lulejozemavumoroxawexe.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jovekudodipak.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/18290218350.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0ace8ac7---rosiso.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16137185b854c6---diveku.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/43626965301.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/40611909729.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/71983481531.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907232505.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_off0000b18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 11032 bytes
SHA-256: ea1a35d70fe222fbc2f6729f8f9605e4e30af204979c56cc66828d6e6457107f
font_02_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 15292 bytes
SHA-256: 93380a896aae6f4de2cf66ed803bb625d63c706892139efe43ae60be6e824b6e

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