Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ab8fb8fece79eb…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 09:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ab5e1db0cf2f8d58c62dc70ae180281 SHA-1: 65e98376e3a1d5de6d843b6c74a4162bf503a7a8 SHA-256: d7ab8fb8fece79ebdbc0e51ab8f6d66c14071ed29a3d83bfd77911f2a01f7f01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to domains associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing/malware lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pixomot.ru/uplcv?utm_term=how+to+turn+pptx+to+pdf PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6cad53a9---dofemejukivupigelina.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/sukoxudumefibalawek.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/5767641012.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/63383835698.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/kepakovowokopofijatovav.pdfIn PDF document text
    • http://superazs.ru/images/news/file/xisetimuwafe.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400f13182ea---demosavaripuxisomozob.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/39256073789.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161539fb6160d9---kofipakaziwawatozivijat.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/wafasusu.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/zonojafejewokowunadimami.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/90153470485.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/regivasiga.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/22286552325.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/ritimitovuxoxebif.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/xosedomalila.pdfIn PDF document text
    • https://istanajp2.com/contents/files/losapo.pdfIn PDF document text
    • https://foodbiz.bdata.link/upload/files/ponujul.pdfIn PDF document text
    • http://myredm.ru/uploads/file/33404343938.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/zaluxalidip.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/jiwedikazinumupuzuj.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/fimupasadifefulebevisefe.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161414dcfaa9a8---wibanuvudigudin.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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 14936 bytes
SHA-256: a4a168d9abef90d1bbd54f6119e941d4b29a902132bb0256a68ac8a25eaef6d1
font_01_sfnt_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 10168 bytes
SHA-256: ab3a17d0e01d1d0ab9e87dc1b2d8c47a64c31d47b572c8b8210954bf604df03d
font_02_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1