Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36f55c53f3b5205…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 17:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1ca1dcee909007d4f7e55acda4b49d19 SHA-1: 7dce968f976ea02ed2366632a04ef3f83ac7b29b SHA-256: e36f55c53f3b52059832a1be51a3e883b177abf512b8cb65de91d7631c22d52a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggesting these are used for link farming on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lyna-garage.com/htdocs/cljr/data/files/18760112562.pdf In PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/puvizuvimenuvatolovezubu.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/vorutanugigipadukutoru.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/dfe315ebfc8f1ebbad5f159087898189/37675614045.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/takotuvularisunoluwigugo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nijitapetatisulowev.pdfIn PDF document text
    • http://www.moyekolodin.com/files/33935185117.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/52686620918.pdfIn PDF document text
    • http://gibisch.info/files/files/vejidawugiwaxowoj.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/23563482432.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/dukole.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/vigiz.pdfIn PDF document text
    • http://rayer.cn/d/files/1250874721.pdfIn PDF document text
    • http://napiarsaigh.com/images/35251907841.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/4123945990.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/95295328855.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/wiratedegozixamowemukaxit.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/xolepeboxasemigetos.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///864083074.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/xeguwadolamexuzamukekaset.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/73330194559.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/66081072148.pdfIn PDF document text
    • http://zenithmetals.com/files/30526658295.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/31445348262.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/pexeforepuremip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=world+empire+2027+mod+apkPDF link annotation
    • 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_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 10560 bytes
SHA-256: 3e578860062b3bbf5a4b9c131a49c3bb9f3f49524f5693c3f28b2bbc0547d451
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 16716 bytes
SHA-256: 95dabc6d396a3fb91d8c0cffbc255af8de9cfbad7f7fe0ae232cad158d340c6b
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1