Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dcfda44d3378c4…

MALICIOUS

PDF

68.4 KB Created: 2021-02-09 11:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 62601b499f50bd73ecf03d63980be91b SHA-1: d7dd8406ff21e8dcff194a477bc08d846f19fb62 SHA-256: 63dcfda44d3378c4a9d71af72f4a1b299836b565f4cb1560c2c4269a9c8dd032
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is 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://seumenha.ru/123?utm_term=baixaki+jogos+free+fire PDF link annotation
    • http://ccckkkkk.space/boss_engira_baskaran_meme_templatekhtrp.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hkQUc5M/46716491570.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/e7ihaic/dreamer_song_john_lennon.pdfIn PDF document text
    • http://beautytopshop.site/84625961691wlh14.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/Q2sheii/idle_cooking_tycoon_tap_chef.pdfIn PDF document text
    • https://fililajivivumir.weebly.com/uploads/1/3/4/4/134456316/lepon_japodez_feletarufi_famuxifobunof.pdfIn PDF document text
    • http://sodalabs.club/binexadajuwizanusebob4jq7h.pdfIn PDF document text
    • http://websporizle4.com/forest_animals_coloring_pages_freeoa50p.pdfIn PDF document text
    • http://cardio-natural.info/html_link_to_page_not_working3l9wo.pdfIn PDF document text
    • http://onlinetyz.xyz/lagu_armada_harusnya_aku_cover_stafabandcae2d.pdfIn PDF document text
    • https://zakulupibuwuvos.weebly.com/uploads/1/3/4/6/134686441/femesujujefod_nevajoninegif_mopumetog.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/kumasala/luganda_audio_bible_app.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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 5160 bytes
SHA-256: 9272d931352b639bbe9038fd1f936820e4bbfa5bab5f5b6e69462b138ac7dfe9
font_01_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 9856 bytes
SHA-256: af34522aedeb7e1018914c46314834d38055b7dd2c50b2e5288695bc5bf7461e

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