Malicious PDF — malware analysis report

Static analysis result for SHA-256 1057fceb6cb8b45b…

MALICIOUS

PDF

75.0 KB Created: 2021-02-28 03:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6240648ff229842497505551fd8976d2 SHA-1: e1029c0bd3f012ce460be44d00915ad0e31ba5ad SHA-256: 1057fceb6cb8b45ba337fc8dc511519b8e8bb9f0e2483bb192ed7399ebc1b73b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'statistics vocabulary worksheet pdf', a common lure for phishing attacks.

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://maypoin.ru/wix?keyword=statistics+vocabulary+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/kosifodalab/jiifTTU/puzun.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/MoVgihc/jungle_run_game_download_uptodown.pdfIn PDF document text
    • http://shimano-stradic.ru/minecraft_pocket_edition_bedwars_map64nr3.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/nxijjjQ/xaxavisizevefidufaj.pdfIn PDF document text
    • http://sadovik.me/boot_camp_support_software_5._1._5640g8b59.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/5Shgihk/life_in_the_trenches_ww1_canada.pdfIn PDF document text
    • http://ridunculus.com/87672054018oxudz.pdfIn PDF document text
    • http://good-production20.site/minions_1080p_wallpapers1auy6.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/bIb1Ned/sidazobosefe.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/patomilolutepedinapez.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/g4ihyjh/rarity_definition_in_english.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/gonafoziguwewe/genolulenikifogivuti.pdfIn PDF document text
    • http://wififeju.atwebpages.com/89262398091.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/zambian_catholic_songs_free.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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5804 bytes
SHA-256: 64620b7513440ced8501ea34e210e198170937acdb764550a1f6200cddde92c1
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10320 bytes
SHA-256: f3507257eab5dac0e073e2f118d9e0bd5288bd5ec8f2619729282aa67142cb66

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