Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0c8fa23a5fa211…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 21:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e67a73725f9076fcfb0ea0b5bb63ad61 SHA-1: 790c6987a237af5f8ab63ed15f87a5d171cfb3f4 SHA-256: fd0c8fa23a5fa211e89f58935b7ca7e69bf637d4ac00c2f126b5c6aa1aa1de8f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded JavaScript and a high number of external URIs pointing to disposable hosting suggests an attempt to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=wwe+2k19+apk+file+download PDF link annotation
    • http://nano-vip.com/ckfinder/userfiles/files/95998231008.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/zovalaf.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/sosapigilisilanukifib.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/44161356855.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/67400672415.pdfIn PDF document text
    • http://ucokampen.com/media/files/masotiwenemonizidixato.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/xadege.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/33399139322.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/kemagugakiguginasuzoj.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/rawuvilaroziz.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/ranopuzas.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/36170396608.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/11412509899.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najamemugebove.pdfIn PDF document text
    • http://lulanjina.net/upload/files/wekonupotuzogeriw.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/42714524152.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/35052821157.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee8b637c5---64832237746.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5179_20210909031614.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/welimebil.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/nakoxinivekefe.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/20055643536.pdfIn PDF document text
    • http://jonme.net/ckupload/files/72891407475.pdfIn PDF document text
    • 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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 17408 bytes
SHA-256: d64e33677472c75b74f5532cc972aa341a57d395490345f43d024f6d6efd649a
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 10636 bytes
SHA-256: 04b676d370d46788b7ceae536caacbdd636f188e6400879c8d41af440b2305fe