Malicious PDF — malware analysis report

Static analysis result for SHA-256 944e1c5e0fa65a46…

MALICIOUS

PDF

74.1 KB Created: 2021-10-02 11:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd750093c76e01bffa0ff657345ce399 SHA-1: 62700d6902ebf2e2e3d812ab76401da99db86ef4 SHA-256: 944e1c5e0fa65a460b6b5e1d10eb06b6045086d4ba8995b0033a44ea1c304700
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with many pointing to domains that appear to be part of a link farm, a common tactic for phishing or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The file's structure and the presence of many distinct hosts suggest an attempt to obscure the ultimate destination or spread the risk across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=lilith+in+taurus+meaning
    • https://investmentskillsgroup.com/images/userfiles/file/pinoni.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613002aa71d81---zuxijawibixunobo.pdf
    • https://umartravel.com/files/mewoxonaxemeropizim.pdf
    • http://yanartekstil.com/firma/files/42367462388.pdf
    • http://refpecsbelvaros.hu/kepek/files/22550610207.pdf
    • https://cafesca.info/ckfinder/userfiles/files/vakozu.pdf
    • http://af.ssla.ru/images/fornews/files/19830084302.pdf
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/95670976576.pdf
    • http://westernmaki.com/uploads/files/8303371535.pdf
    • http://chinhlytailieuluutru.com/media/ftp/file/didinubipujibuzux.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146ea7f695ce---sukeko.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/93748523694.pdf
    • http://klenderbio.com/upload/files/74724664717.pdf
    • http://proficlim.ru/public/userfiles/file/lezewawitirudobiwuroweko.pdf
    • http://citranco.com/users/files/13487426006.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/wiviwugabasotilenevuzunir.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161413b9ae1f65---93228061126.pdf
    • http://vijyaiprismcrm.com/userfiles/files/vijewoz.pdf
    • http://bivalyracing.hu/files/file/gejat.pdf
    • http://laibros.com/ckeditor/userfiles/files/8731619103.pdf
    • https://ristovski.mk/public_html/upload/userfiles/file/42486005181.pdf
    • http://1666-3668.com/attach/userfiles/file/97446820112.pdf
    • http://batistar.fr/userfiles/file/67602898435.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/2957835443.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca7.bin
f0d70ac130fa725c3672f8118d18ae3f2230b7a263fb80edf80f79c9b959e8cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA7 10492 bytes
font_01_sfnt_off0000d447.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 16792 bytes
font_02_sfnt_off0000ec59.bin
c66512fadcc08679521a1a9a30ff28abdae4c92a288cc5c274e06dab766faf2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 18072 bytes