Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cbdfc35ae624d7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 13:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12a5a101ae561b9763811da9e98b26af SHA-1: 6280af2c252bc5ad5f04a2d27f13b5e1b64ca6a2 SHA-256: 86cbdfc35ae624d799e730adc682e7edce786afeb30384e03fb584cb8ea9bb5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/16274680027.pdf In PDF document text
    • http://jubileejec.com/userfiles/files/28776258077.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/buxifavojapazak.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/fojitemuwanarikanog.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338252d68a4---nedufugexovesigiferi.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/fobogalojo.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/50964811543.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/99391231635.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/kirojuximeponiloxubulon.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/ditobobu.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/lulusipojefas.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/56297911782.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/rekuwip.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/33016289919.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/98161796204.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/botovi.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/29325391862.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/98285540051.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/bijiloxalexojurobo.pdfIn PDF document text
    • https://botroul.be/uploads/48207366390.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/62628197212.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/38798822121.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/kinuwenuxiwevuxu.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/jiwexikulozi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65341692893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=peter+rabbit+gomoviesPDF 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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10508 bytes
SHA-256: 0b501657b32a48a7ce70d3d04d651db1779e0effe2b03eadd7db361a82143a7b
font_02_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 17940 bytes
SHA-256: 1a7f875bbb1ae4dc0bc8256e0b5240d5909a94d2d88ea4ddf955116c26caac9a