Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46319d9c613a858…

MALICIOUS

PDF

76.0 KB Created: 2021-03-02 18:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: fcb7b1371d1d440a79eb64842828e81f SHA-1: 4494a5fe04a6988b50a0b8217d0a0328fb5fb456 SHA-256: a46319d9c613a858657524abbd7e025c8b5fc0fc3176bf8af51b7fc15e64f98c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to gift cards, suggesting a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/123?utm_term=brandy+melville+gift+card+europe PDF link annotation
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/vonarojix.pdfIn PDF document text
    • http://xalafunil.22web.org/formar_animales_con_numeros.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/pokidem.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/rofabekasuvun.pdfIn PDF document text
    • http://biomaniix.website/67467323297dj4d0.pdfIn PDF document text
    • http://casbah2point0.com/87760843182j255s.pdfIn PDF document text
    • http://bojidodug.iblogger.org/sejapavupovidipufajuwod.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/kewenekegemumal.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/12045673002.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/yoga_vasistha_books_in_telugu_free_download.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/1645104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doriponesarom.myartsonline.com/how_to_build_a_septic_tank_leach_field.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/adding_mixed_numbers_worksheet_vertical.pdfIn PDF document text
    • http://bavutikoguvumit.rf.gd/craftsman_190cc_lawn_mower_oil_capacity.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 5508 bytes
SHA-256: 1b66967bf6c9bf68284687af3f90efbe503b7977384b8a90fa36e4a3d87707ba
font_01_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 10684 bytes
SHA-256: 701bed7c4f0ca72b6458d70a337f215bb935cecaf33ecec5310bbb9949f1c425

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