Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d523ee47e3456b…

MALICIOUS

PDF

82.5 KB Created: 2021-03-02 21:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d79e726fb7747559c105fb3b812598c4 SHA-1: 1c517d4374aa680d71fed18a35d3fbf857805272 SHA-256: f8d523ee47e3456bfefb18aa263faea547dca213c671ae117f511e68a5a380e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to historical topics, likely to trick users into clicking the malicious links.

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://fokemale.ru/wix?keyword=salem+witch+trials+history+channel+documentary+questions PDF link annotation
    • http://anarchymedya.com/black_book_html_5.0_free_downloadj72z9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fe3d7cc22fe4.pdfIn PDF document text
    • http://beliyden.xyz/208286193459tg7y.pdfIn PDF document text
    • http://com-connexion.xyz/feminotovasunnv4m2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5ffc8863d0cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_601602952daa2.pdfIn PDF document text
    • http://safetymirrors.xyz/56516339377zdazz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5ff043f6d1cf2.pdfIn PDF document text
    • http://hookup750.website/tapsilog_business_plano87h9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_600e067ca10fb.pdfIn PDF document text
    • http://civiliscmq.online/chapter_6_the_periodic_table_vocabulary_review_worksheet_answershd13h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_6035a59b2996b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_60265b202a5a2.pdfIn PDF document text
    • http://online-sistem.site/what_is_canon_in_art_historyno7wt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutipebufige.epizy.com/11289992758.pdfIn PDF document text
    • http://wowifimeziv.rf.gd/80221349686.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/robbery_bob_2_unlimited_coins_game.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_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 5600 bytes
SHA-256: 5a9224370afa87a7cba8b11cd68f54821969be1315a285f08477079076d20ca3
font_01_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 10240 bytes
SHA-256: de85eb837c99c2f0347e88a8dade1a3055f0e860569b6315b9bd77664debf12c

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