Malicious PDF — malware analysis report

Static analysis result for SHA-256 892577478b8c18c2…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 14:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28c2bc4e3af4f17dad8e50de64db5c8e SHA-1: 7f23eb6f5f119f0b21af2ad7ab6ad96ef2690345 SHA-256: 892577478b8c18c2a88d6c311648e3da9f709841421cfb305d696f3433fb4913
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to direct users to potentially harmful content. ClamAV detection and ML classification further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://esipro.be/userfiles/file/50550798889.pdf In PDF document text
    • http://filtrydokoparek.pl/img/all/migeditunekamafisonasawu.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210926124854.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/simisujefozigadefito.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/41649670533.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/70225995749.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/77259137656.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/wevomibusikimurowoli.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/rafuzitakogupifiden.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/pojinozigikeberala.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/pekatuzuvevuxerijaf.pdfIn PDF document text
    • https://vanchuyensahara.com/site/files/sumijevoli.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/52622633140.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20211001_28D4A2B1E4D14A96.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/felagekezu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021100100554140229.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161449c41c1578---kepap.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/91021303056.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210929091501.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/74631425343.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/49730728443.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///bigugovagedesek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+emulator+terbaik+untuk+pcPDF 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_off0000b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB386 16484 bytes
SHA-256: 5349e4a8cd818f19ac4f023ec60512fc6b0871f4f7869eeb7ce0d408243d2217
font_01_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 10820 bytes
SHA-256: fe2695523488deece92836a6e5a0dfb7a6367e77ea585842f344c8381d2b616c

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