Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f3281ff6865296…

MALICIOUS

PDF

73.8 KB Created: 2021-02-12 11:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: de589a74efb988b1b0888cf3ad4b6a82 SHA-1: d526742cb27c59346acb421e44a929b3ad0f92c4 SHA-256: 67f3281ff68652962254cce57f6ee01dd7986a3227a692937f04ecc24562c2de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites for further exploitation.

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://baarspo.ru/wix?keyword=impact+of+the+industrial+revolution+worksheet PDF link annotation
    • http://videohost.space/maldiciones_sin_quebrantar_rebecca_bhn986.pdfIn PDF document text
    • http://workbykoder.xyz/79476459278k8l1a.pdfIn PDF document text
    • http://sayseedokg.com/35992036988nbiv5.pdfIn PDF document text
    • http://arevakar-travel.com/mindshift_online_learningdtwv5.pdfIn PDF document text
    • http://mini-cam-v2.club/advanced_excel_books_free_download_in_hindi1zrfp.pdfIn PDF document text
    • http://silver35.ru/mofavadetogemoteritefefwgppu.pdfIn PDF document text
    • http://webdefilmizle.com/700487972732u7yz.pdfIn PDF document text
    • http://fufibubesex.iblogger.org/37857982211.pdfIn PDF document text
    • http://redita.fun/ejercicios_isometricos_para_fortalecer_las_rodillasesrch.pdfIn PDF document text
    • http://beststudent.fun/free_fire_samurai_wallpaper_hd_downloadqr7p9.pdfIn PDF document text
    • http://my-favshopg.online/tangram_puzzles_freegvf0m.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/xukanomarexumu/young_sheldon_episode_guide_air_dates.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/tebabevizolatuxerokis.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/google_account_manager_apk_7._1._2.pdfIn PDF document text
    • http://foripoj.epizy.com/acunetix_with_crack.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_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 5548 bytes
SHA-256: 364d8f29505219399ebdcd62e9103a30af408861c9a4fc9e346c300460cd990a
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10320 bytes
SHA-256: c05ec10c6bf10acd526189dc46a62e6767b189606f12ffd2b1d13cb2bf87504c

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