Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c4159da73ee375…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 16:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70e892ad329286a302125d390724be4e SHA-1: 50df4999ee1468df04324dddc52e0cb91bcf0d23 SHA-256: 21c4159da73ee37554b7187c13147dcdbd10e3af3d664c99ccaa559b25e288f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, indicating a phishing or redirection attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV also detected this as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=non+stop+malayalam+melody+songs+mp3
    • http://theofficeplus.com/userfiles/file/7817926193.pdf
    • https://htapigroup3.com/contents/files/bovotigozomitoduj.pdf
    • http://alpha-cp.com/userfiles/file/46839383016.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/nijamomulipozaronexani.pdf
    • http://dautuck.com/uploads/userfiles/file/xumifine.pdf
    • https://birutelorasin.com/contents/files/zonivex.pdf
    • http://jiin-torng.com/uploadfiles/20210918014957.pdf
    • http://maslatalaia.com/userfiles/file/67451236643.pdf
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/85905517329.pdf
    • http://jessie.vn/images/ckeditor/files/5352519111.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/23059e6d045c4366c7fbaca14a294d9a/faroxidejomizezozeve.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/rijukejolo.pdf
    • https://birotex.rs/images/files/sonufuserujebevikagoku.pdf
    • https://gastriklandsbf.se/UserFiles/files/33689020733.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/19300236271.pdf
    • https://njshore.drinkpoint.com/uploads/files/57295295876.pdf
    • http://adance0112.com/upfile/editor/file/tisegivazokereviwiwijinu.pdf
    • http://agcslohian.com/userfiles/file/jugobegaj.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/xuverozamutojofefirotaxew.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/32761003951.pdf
    • https://buyafranchise.org/files/files/jatebad.pdf
    • https://vespaclubcagliari.com/userfiles/file/99171373115.pdf
    • http://artin-intranet.com/ckupload/files/puretulitavanipapat.pdf
    • 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_off0000b265.bin
c1182d42c30df518629bd3178c23d71c8cca5da102bdaa34eab60a49cfd1f985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 15520 bytes
font_01_sfnt_off0000da47.bin
75630c9168a6f0f19edc4da1624f5f3491a3b94fde72589fd7920fa6ba0a227b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 10808 bytes
font_02_sfnt_off0000f312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 16792 bytes

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