Malicious PDF — malware analysis report

Static analysis result for SHA-256 06dff96afc1fd4bf…

MALICIOUS

PDF

35.7 KB Created: 2020-06-10 07:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c3ce43883705745efa76a71425d8b51 SHA-1: b79ebf3a2075c6ddb211dd87caf183910553eb4d SHA-256: 06dff96afc1fd4bfd1bacf48734dbab88b305dcfac91e34812ac22990ef24b41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to a large number of embedded external links, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of numerous external URLs within the document body and the PDF structure itself indicates an attempt to direct users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Dropper.Agent-8632521-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8632521-0
  • 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://corneliuscollinsiv.com/uploads/1/3/1/8/131856185/131856185.html#pdf+%25C3%25BCzerine+yaz%25C4%25B1+yazma+program%25C4%25B1
    • http://webdisk.ajrplasteringessex.co.uk/uploads/1/3/0/7/130739530/kolovoje.pdf
    • http://bellevuesportschiropractic.com/uploads/1/3/0/2/130270746/malezaw_maxubiwes.pdf
    • http://christinabeautyparlour.com/uploads/1/3/0/7/130738975/6229327.pdf
    • http://iper.business-facebook-covid19.com/uploads/1/3/0/7/130775274/051ee3b543.pdf
    • http://jacobshawaiifarm.com/uploads/1/3/0/3/130379213/moferozivulepe.pdf
    • http://dispensable61.goteamonline.com/uploads/1/3/1/0/131070602/liruvoz_xutiseviji.pdf
    • http://4gamersdepot.com/uploads/1/3/0/7/130776257/632711.pdf
    • http://daonmortiiei.com/uploads/1/3/0/7/130739923/6653059.pdf
    • http://mta-sts.mail.reidiantlighthealingstudio.com/uploads/1/3/1/3/131382141/tavesudowem.pdf
    • http://oliver-design.com/uploads/1/3/0/7/130775478/642f1798.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://lawivomeru.files.wordpress.com/2020/06/56264425442.pdf
    • https://rabadudi735864872.files.wordpress.com/2020/06/jumavipapofupatigizeruzar.pdf
    • https://gomubefibi.files.wordpress.com/2020/06/xovovuxolanebunabadaw.pdf
    • https://sosasifen.files.wordpress.com/2020/06/nodepalepot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b6c.bin
cd5fa13f5932026142c4c6e1f9617b0cddb746bf162b2cdb6bc574923afec3bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6C 11932 bytes