Malicious PDF — malware analysis report

Static analysis result for SHA-256 087d4c3962f138bf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 20:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c5a621fdd31d3eb43365486a96c06323 SHA-1: ab9c068179d5afdf0f5be5228bdff3cf7fcf5e3f SHA-256: 087d4c3962f138bff76edeb68ab4be14fbc2253d32a11a790178d9a2a85ffc03
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vxclouds.com/userfiles/file/85589883505.pdf In PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/90673981494.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/vopemosetakatefanixiw.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/watebuxabajojazebosixobaw.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/71109831736.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/78464921980.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/80748868204.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/kegudalixovorib.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/kemonupa.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/boniripusufevas.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/fisoselonajiwewipomuniwa.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/99095599814.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/79692613452.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210909042751.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_000459.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/mimudusudakunakozexevew.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/51611527651.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/muzofelamoxivizub.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zeranumul.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210910231726_dbryxx.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/96039261806.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/21751067409.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/82754057350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=impossible+quiz+answer+62PDF 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_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 17384 bytes
SHA-256: 1cc50295fc17facbeaecb09588249ec5f928d4f3923bec5c72e2204f7f743e41
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 11088 bytes
SHA-256: 680c5ef22203db8e8a3aa87c8174b351f2c9cacce0eb8fdcca9eade4a602d6d3

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