Malicious PDF — malware analysis report

Static analysis result for SHA-256 6657ca68e0fe44ed…

MALICIOUS

PDF

78.3 KB Created: 2021-10-07 09:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c9fbbdf10304ef17bf727e039407141 SHA-1: 88b259a7d5f23bd29011b34309b43d5ea31a4c7b SHA-256: 6657ca68e0fe44edc764ebdf7a7f22b7dd5c15a8215ee54b546abb48a6f8d64b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and multiple unknown URLs were extracted, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vanhacollection.com/images/files/geligimus.pdf In PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/nubafumilutowiliwifono.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/85608678264.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/sebidodegabi.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/63535981255.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zoluwedu.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/jonokes.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/98470967116.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/jemifalusobuwutug.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/s08ttr1lkgs7f830o8o2ksfenf/babejamibizikagimixubixa.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/tezumujisufadorutizakegum.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/nixip.pdfIn PDF document text
    • http://cityfate.com/files/files/jagujivureruxux.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/bumaweruluzinixuv.pdfIn PDF document text
    • https://mcsfood.com/images/file/73335946426.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/jifarojorojoxovamoxu.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/zevosixuv.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/14920319446.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/fasoraxofuwenisa.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/7945805458.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/25020973421.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/zutuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=latex+title+pagePDF 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_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 9992 bytes
SHA-256: 9ebf6f72c3a119e1eee423a01cc10a71309ce459c2700cf729173fef66f0f2c7
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 18580 bytes
SHA-256: e06172d6844706b6fbe9cb5f4ec00c823ee02e233442ce02f22a774dfd302927
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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