Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc659a23f7c6da70…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 11:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5af2aad7d970340e8b003184f181977f SHA-1: 0f3680d024bd294ddb49f92a2551ffe4ac3ee751 SHA-256: cc659a23f7c6da70cf1234a3b587db6e205330491f58a395f203c14ddb7d4e1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=phantom+forces+money+script PDF link annotation
    • https://harkakotony.hu/UserFiles/file/33950894944.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/lurufowiwebusido.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/totunabilenoveru.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///lijekuvuretevozi.pdfIn PDF document text
    • http://wych123.com/upload/files/42464692206.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/384655742.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee19419ab---gepakazugitut.pdfIn PDF document text
    • https://huanghecables.com/d/files/26437574374.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/74658931965.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/77476183081.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210907230413.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/zetizorinulisaj.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/koluvise.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/44137284561.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/79463693469.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/gixoxexojetoze.pdfIn PDF document text
    • http://prompol.com/media/file/72616303682.pdfIn PDF document text
    • http://mp-journal.com/media/file/puzelukutaxurituwuwifizo.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/36709614845.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d934d9d6---23442360425.pdfIn PDF document text
    • https://adikketiga.com/contents/files/defamonuvujeterujuze.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/wutuvagazib.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/surapazedesupepedoka.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/wesig.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/mibase.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 20392 bytes
SHA-256: 623aa53af568d3024d74618d03ab1c17da0907aad5d54e4d7018563cb4509e5f
font_02_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 10812 bytes
SHA-256: 3906a9f1ba6890ba57c544bc1ee373e72cd125504f53ed948dbfbc92e9f48c82