Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3318dc57a4d3c7f…

MALICIOUS

PDF

75.7 KB Created: 2021-02-17 09:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 135b823c4d13da2b681f526e9fc37159 SHA-1: 90547bcb51c4c5b9a5e8c28be22f0ef81ac5bf59 SHA-256: c3318dc57a4d3c7f7e3b86c08165cc96780b47140dc19472f16c9867d31e317d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure designed to redirect users to malicious sites.

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://bologen.ru/wix?keyword=msr+miniworks+instructions PDF link annotation
    • http://legko.travel/xelonim3hc.pdfIn PDF document text
    • http://mifvideo.space/pipulanarovijuj2wf8.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/3piaWAk/calendar_august_2020_printable_free.pdfIn PDF document text
    • http://beach-fruit.fun/the_freelance_manifestoeit3m.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/PxgjhiB/minecraft_unblocked_online_download.pdfIn PDF document text
    • http://fit-italy.space/eve_online_anomic_agent_guidewvely.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/qjbghc8/flat_pack_couch_ikea.pdfIn PDF document text
    • http://nagaxutunasom.22web.org/blame_game_instrumental.pdfIn PDF document text
    • http://teaapple.space/40954012806xgacp.pdfIn PDF document text
    • http://bagabipum.iblogger.org/18298972777.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/ihhggei/justin_bieber_boyfriend_mp3_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixabaxoji.epizy.com/animatron_studio_pro_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/dilutions_worksheet_answers_if_i_have_340ml.pdfIn PDF document text
    • http://pewazeje.rf.gd/9068290924.pdfIn PDF document text
    • http://nawonuzegajosi.epizy.com/lonarepawuw.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
    • 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 4864 bytes
SHA-256: 548de5dc6205d6c2cc5fa02da4d4e9596c3f0aa6f830f84f600f406f56f95eda
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 10688 bytes
SHA-256: 236e03f463adbabbfaa3c5bf980cd3e9dc4dcbbd352084622a01c563ee9aabcb
font_02_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16196 bytes
SHA-256: ca169d226e7270d6c57da5eee88bbe599419370be5c4aeb7f8bffd21c6857157

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