Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8cce60ddf530c5…

MALICIOUS

PDF

70.4 KB Created: 2021-10-08 10:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a32e77df1fdc03a69a049082b3e55b32 SHA-1: af08ada4fb2d3f3a582413988c994e31b7eaf1ba SHA-256: 5c8cce60ddf530c5f5121c0a0881f08b4ce404681bb02e7d75ae3662f8ed1b76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm designed to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern of using numerous links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/99495884522.pdf In PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/14943850407.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/jupomarupuvapotavaful.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/lobanejugoniforalotuxuben.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/neburinewakepawebavuzo.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/46217011361.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/nizitisukujoge.pdfIn PDF document text
    • https://kermanrooz.com/img/files/96374179508.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147201db247c---debarolejezakekutugasovuj.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/wojapiraturefigixogob.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/89780931346.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/dafelavazuwevuz.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/gimolafelokit.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/dalerinefabip.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/beluparejebaza.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/gufadevavanev.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/89801030124.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210926100530_9fhert.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c0ab2b44---kesumelajepazala.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/nevenupu.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/mipuferuwipevijow.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/98317351894.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/deborejega.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/84264369262.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/34341659640.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/9373886362.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/98627908659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=when+does+gacha+club+come+out+on+iosPDF 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_off0000b3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0A 15448 bytes
SHA-256: 64f78e58835df94c2f940fe615c390ae2eabe6278f6952e93a09aad106f469ad
font_02_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 10952 bytes
SHA-256: 60179e7cda725abb5994ad52161f194ed74f9e2692ca83ac162c417ebb4ed3f7