Malicious PDF — malware analysis report

Static analysis result for SHA-256 985b04c61a8160f3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 09:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75a3b46ff94663593850bd999dd90181 SHA-1: 100f6f63ea2fde16f176a9b5678e58e1fa2b5fa1 SHA-256: 985b04c61a8160f358f1b6e38e9667833e840e5bce46c74167b94583043b49ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cdmsig2.com/ckfinder/userfiles/files/90784669462.pdf In PDF document text
    • http://casms.org/atts/news-files/file/11993910954.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/49327835992.pdfIn PDF document text
    • http://apicn.net/upload/files/22457795327.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af98960bc9---99542616406.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/naloxitowalidibajulexuzi.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/tasinapixavew.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/30095791074.pdfIn PDF document text
    • http://belovosushi.ru/files/fetijiloposex.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/90831620475.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210905090157_1761985808.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/maniliz.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/gimajezewuxemodefesinuv.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/73372152352.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/25315962812.pdfIn PDF document text
    • https://priscar.com/documents/files/gisatatebeko.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/mujobivegisugisezakogixem.pdfIn PDF document text
    • http://upakuika.com/img/file/zopifukuvidewuralimakixa.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/23435322884.pdfIn PDF document text
    • http://www.puhito.hu/uploads/22923628231.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/zozekukinoxa.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/78267804335.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/milisir.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2ce7575fdf0bbbcdfe7cb9fcfe246756/87295573313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cinema+firestick+apkPDF 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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 10596 bytes
SHA-256: b8296f63c526c7bcb9e5666dca4ff578aeb12467cc55b9cbd21e3f80bd6fe1cf
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 18488 bytes
SHA-256: 6c3709432e05f672eec9a811a328e4cc8f4b72f8ad1e67153df7c7815a1f978d