Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d8c3faf4bdf5f7…

MALICIOUS

PDF

71.6 KB Created: 2021-10-01 09:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b5c3285a3865f7108c2266664dfc9b1e SHA-1: c6fa4089784623b0885c3640a087567873e07a14 SHA-256: 86d8c3faf4bdf5f7c02b18d66d5a3d72ba99d1077c246f3d4dd7acf294897482
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://philabc.ru/uplcv?utm_term=score+hero+unblocked PDF link annotation
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f674072b27---18539569594.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/tagafejotofufusuv.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/28477786198.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/wezuminoreloxulo.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/62583581033.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/fugifejaguso.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/biziponilalujemunixebun.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f4cnb863p8m0h0j6a6s2ripp3d/36456074847.pdfIn PDF document text
    • https://invest.pl/userfiles/file/1709733223.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/11092836131.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/pobumogasijotiweb.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/51193496484.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210922_193518.pdfIn PDF document text
    • https://best-label.com/upload/files/56951116735.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/15946104333.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-07/210907001743079539pbbvrrkpowns.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/wawelipesijogidizukax.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/sazekuzirozufawuro.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/97675634195.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/ponorajefuzu.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/difojupifevaxunen.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/janawanupixosumigivewo.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/42551795884.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/48469331325.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/rupokupexagedivepixiw.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_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 16928 bytes
SHA-256: 65aa41d8f9c08cf45dd9d824b80bc5d54072dd86273057f1ba3e80a69329d3ac
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10356 bytes
SHA-256: c003783d97da55790ad4d53bc5b1cf7c2576c874d775125f73a5e508c60ccdff