Malicious PDF — malware analysis report

Static analysis result for SHA-256 f915005a8bf5d665…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 16:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52ef930d545c77f9edf989b2e3885858 SHA-1: 2c6110e6e11c8fc8970cfa3aa7bb31e8b015341f SHA-256: f915005a8bf5d6656a330cfe02c9f143ae6b1f2c2e983f8999f0b5332c1d323d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a collection of links on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://nomylo.ru/uplcv?utm_term=android+app+with+flask+backend
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/boris.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614257744f52b---dugev.pdf
    • http://skia22.ru/pic/file/kelumalipo.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/69490247932.pdf
    • http://autowassenindex.nl/images/uploads/mawipogagagorifobisiz.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/3989418670.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/rofepukon.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/wanefisopifudexaxugi.pdf
    • https://cpsguffanti.com/uploads/file/75329210435.pdf
    • https://contemporaryteas.in/admin/uploads/file/39255167796.pdf
    • http://whipitleather.com/userfiles/file/91267650339.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/demuze.pdf
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/88930460357.pdf
    • https://protum.se/file/95878994935.pdf
    • http://www.pattyn360.com/upload/forum/files/28339039521.pdf
    • https://soalmatematik.com/userfiles/file/44400945808.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/71218779547.pdf
    • http://cmrivestimenti.com/userfiles/files/17760098217.pdf
    • http://ipayon.com/root/FCKeditor/file/58199076383.pdf
    • https://monyetmesum.com/contents/files/wunezuzejopok.pdf
    • http://xycrusher.com/d/files/ginadivexitirakasew.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/pomezu.pdf
    • http://shijijiaming.net/filespath/files/20210907205709.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/kaloxugatemekeba.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_off0000ade8.bin
2cf1c503fb395bfa6722a0ba8ab7740183edbc26791bafc9311433ea67c4f4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 11016 bytes
font_01_sfnt_off0000c74f.bin
aa08addee7cae97ed97034f71e9e30a51c570ae91e635fba2e049f8c1b791249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74F 14980 bytes
font_02_sfnt_off0000ec7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes

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