Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2041a524eb7b57…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 06:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1073e5e8bab6350f4db0dfcf9f62b18 SHA-1: ed81718e443dd9265369194062abbe7eeb5ffc12 SHA-256: 4b2041a524eb7b577e926e9d348363bf8861bd83347ebcaf559765b8aa209bcd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were directly extracted, the PDF structure and embedded links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://bidmitt.com/img/files/file/bejozezudebiwiwuser.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/kigulegagijaxunenetoga.pdf
    • http://italianopizzeria-pg.com/uploads/files/nirujatagovufizobiwegor.pdf
    • http://veronikavilla.hu/userfiles/file/zuvevid.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nakegoregenafanumax.pdf
    • https://capitalsyndic.com/userfiles/file/piwemaxeti.pdf
    • http://yarpb.ru/pic/userfile/forunekemon.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/79754358598.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/18851474368.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbda14abb---retijedabotezogezuvuzona.pdf
    • http://www.iece.in/userfiles/file/6844702624.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/73978040467.pdf
    • http://gintaras.cz/userfiles/file/60717688529.pdf
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910225713430620.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210904_87A1DA0D80B68D94.pdf
    • https://expomediainc.com/upload/file/98252173313.pdf
    • http://trumoi-khutrung.com/upload/files/bafejonotumavemesapexora.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/84288770715.pdf
    • http://uralcomservis.ru/crn_fls/crn_files/98641158705.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/61941577854.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614070e18cb48---gexolivaruxame.pdf
    • http://burchiellati.com/file_fck/file/57196563293.pdf
    • https://ssmavidiyar.com/public/content-images/files/pivifolodejapu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+lightroom+cc
    • 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_off0000b5ea.bin
c4450259c2154282c48d8d98314d1813894bab32b2199171b62f5ebddf55f31f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 10220 bytes
font_01_sfnt_off0000ccc7.bin
cd75ccd78948c4d55d74e34debcf1feba92f6cf8879a87951acbe01c44e4e78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 17376 bytes
font_02_sfnt_off0000f93f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16792 bytes

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