Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a02b34c3fc76c2…

MALICIOUS

PDF

73.1 KB Created: 2021-03-29 20:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f226e594adda03ed727b974b2d57e6a SHA-1: a8064711accd838fb9dde8bf9b94e6dfc40e6bb6 SHA-256: 66a02b34c3fc76c23d8715de2d15d4a8fe67e4a0acc46ccc86a8a6e212ace8c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=scorch+trials+book+short+summary PDF link annotation
    • http://brumbum2.xyz/lapopejatifoxuzukopolens1zmy.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/igN5bFK/tales_of_windspell_hack_apk.pdfIn PDF document text
    • http://world-wild-shop.com/how_do_you_crochet_a_beanie_hat_for_beginnerskcwu1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_60377c88947b6.pdfIn PDF document text
    • http://iwhite.space/44395364232t3hvi.pdfIn PDF document text
    • http://rabota-plus.club/36896823098fpnrg.pdfIn PDF document text
    • http://ranefadosef.iblogger.org/jeditalura.pdfIn PDF document text
    • http://vokegitejupud.iblogger.org/freelance_reporter_jobs_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/JgizsBa/ghost_rider_live_wallpaper_gif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481518/normal_5ffb6badd3483.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/98uUigg/tevomogexafuzesekorojaraw.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/22840479310.pdfIn PDF document text
    • http://ralununajopupe.epizy.com/adjective_clauses_with_prepositions_exercises.pdfIn PDF document text
    • http://xukonepuwe.rf.gd/transtorno_da_ansiedade_generalizada.pdfIn PDF document text
    • http://kopozeluzel.epizy.com/capital_structure_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/62744715512.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/excel_file_using_ajax_php.pdfIn PDF document text
    • http://wumepudefix.rf.gd/bobtail_dog_breed_information.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_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 5448 bytes
SHA-256: d70e9456b86f4e7d0eb72c2e9a50749d14705080385dac073b31e975e23f37eb
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 10792 bytes
SHA-256: 8ec624bd18ef84a3483b4ff348e2a03dbaf47e456b36d53125a99c7dae6b4bbb

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