Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c20000be075a41…

MALICIOUS

PDF

88.4 KB Created: 2021-09-13 21:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74863027eed073da4d5498b408192579 SHA-1: db9630081c67903aee959de8afad96cbe8f65dec SHA-256: 69c20000be075a41b5e893dfdbd7cb3d88fc666a61961a440d8d585a93742f98
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure the true malicious destination by using multiple domains. No scripts were extracted, but the presence of multiple unknown URLs points to a potential download or redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://prochem.vn/images/uploads/files/nexuvaribelixidi.pdf In PDF document text
    • http://kaies.cn/upfiles/210912133233256535lic4ag.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210912220619627.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/baguwoluwiruwokub.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/14548039475.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/87086337915.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/606488836613f41e8bfded.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/pasekete.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/bavifevanim.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/jigoxisimiwule.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/27126643696.pdfIn PDF document text
    • https://umutfm.com/resimler/files/91033218379.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/ruleworubupep.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/muwujagitipekemesanatij.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/85334436959.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/muriboxefiketonesagi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff25b19ba---tivabiranoneduvewakuxo.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/1582607958.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/44822087814.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/bojavawifuzogox.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210903_201011.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/nuzexaw.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/newebunazefopodaleri.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/31890438261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=copilot+app+for+androidPDF 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_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 10220 bytes
SHA-256: 344e6658780890d1a1c2a5ef9fce290a161d987374ee67f58d9906e6d295869f
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 19828 bytes
SHA-256: 3b179e6989f4a80987a1432cf9f8466ede1ccf63819660339f279682de0fee1c
font_02_sfnt_off00013bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1