Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad2cae30f34b789…

MALICIOUS

PDF

75.9 KB Created: 2021-01-18 07:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0584a6991479b0d59055e857c5d2f426 SHA-1: c2540d41c51a72ab0378e736f39f043354c0e3dd SHA-256: 6ad2cae30f34b78917992253f5bf486d715aa71df7ead16d71f2e0b7a316085e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, with one prominent URL pointing to 'traffking.ru' and containing a 'financial support letter for medicaid' query parameter, suggesting a phishing lure. The PDF structure and the presence of external URIs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=sample+financial+support+letter+for+medicaid PDF link annotation
    • https://site-1178075.mozfiles.com/files/1178075/wixoxolekakedokebalafulip.pdfIn PDF document text
    • https://site-1172701.mozfiles.com/files/1172701/dadiwaporulak.pdfIn PDF document text
    • https://site-1175371.mozfiles.com/files/1175371/companion_for_bdo_apk.pdfIn PDF document text
    • https://site-1180537.mozfiles.com/files/1180537/surimifupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5fa650005d074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468553/normal_5fe2701457c6c.pdfIn PDF document text
    • https://site-1187178.mozfiles.com/files/1187178/dotted_line_connector_in_powerpoint.pdfIn PDF document text
    • https://site-1171720.mozfiles.com/files/1171720/caltrans_encroachment_permit_application_guide.pdfIn PDF document text
    • https://site-1173730.mozfiles.com/files/1173730/national_geographic_channel_fios_ny.pdfIn PDF document text
    • https://site-1176740.mozfiles.com/files/1176740/jump_and_shoot_mod_apk_android_1.pdfIn PDF document text
    • https://site-1180756.mozfiles.com/files/1180756/nokoleduwiripudiduge.pdfIn PDF document text
    • https://site-1174921.mozfiles.com/files/1174921/advertising_campaigns_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f8bcf8745484.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/wifi_analyzer_free_download_for_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/sun_moon_deck_at_great_american_ballpark.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/agnyaathavaasi_telugu_movie_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/jakabeniboru.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_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5404 bytes
SHA-256: 08e40314b452fd07562c3365a5126bef7d3249f079b975fa946313bd132d4aeb
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 10120 bytes
SHA-256: ed99e29ac9720989ffd750fa1a0d9bb6b52e9a5d6783a9bc4bb5f207bef89c82

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