Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0cd87ccabb2a40…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 11:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a47ea7d9cb3d179370f8715177782773 SHA-1: f54839dfd782e24698b5bb9ba58ed9e1c6744936 SHA-256: 5d0cd87ccabb2a404439fa6c10e0eb2e77b260ea01efd4ca56efb6c457d5cf63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to a non-clustered link farm on disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://crysiq.ru/uplcv?utm_term=index+cursed+season+1 PDF link annotation
    • http://smcertificationservices.com/userfiles/files/komofezaserejozudiriti.pdfIn PDF document text
    • https://tonicsuitemusic.com/userfiles/files/zoxalufitujabize.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/vapagazozovinagufida.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/waforuj.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/kaforofisagudukumiwomur.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210921_ED1F056629A11151.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/58711140294.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/rixoxirejidoselibidep.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/98635185429.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/gegosuwazuwupusab.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/lunobobavizirap.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kizixinoledupa.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/tufagesewifigakupabobe.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/47827300477.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/85862932566.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/25270309178.pdfIn PDF document text
    • http://polipack.ru/content/file/65396658943.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/juwarafap.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/95308319429.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/74389097402.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/42097833142.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/28917036745.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/nunixukefevapilezejuw.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/38714219110.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/15080148138.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/13059631750.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_off0000b17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 15532 bytes
SHA-256: fe45a0adc2a6757e5f45b1216210b6a214a50e3e9e50b2cf587d722e65e6331d
font_02_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 10332 bytes
SHA-256: 7aaab49b1acdedd07229e36d21357dfeb80ce5f84e58e046ac7d729842ed6322