Malicious PDF — malware analysis report

Static analysis result for SHA-256 de22085879781799…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 07:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5032028120d36d93603611c02d1de897 SHA-1: 11d376a31bb12b94291a377608220b8cd725f786 SHA-256: de220858797817994748b07de24390ca4c22131e94cc076d81513fe669e66241
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=keypad+bluetooth+android PDF link annotation
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/biniwuwerikatinakob.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/zakefomopesakebekivupo.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/bojab.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc959a026---25761844528.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/11876110415.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/7900195650.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/gigilapilo.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109172002091045.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305abd30d17---poxebag.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210923_CCB813AB5DC38D1E.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/juwibigosidida.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/37371427139.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/70383012812.pdfIn PDF document text
    • http://elsped.hu/files/file/43614565786.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/19412531950.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/97984788811.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/97247846099.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902051519_0priy4.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/80681209576.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/wanudin.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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 17848 bytes
SHA-256: 1d253b429dce7dda5c4759ee0d7789729211c25cbc58037485cf9f754fb60a18
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 10664 bytes
SHA-256: 9bc1b2d793731e6f41402e74fa945a04cbfc41f61a2b17a6ed38145f1d4f4ece

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