Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f21e1f0326e6b9…

MALICIOUS

PDF

72.1 KB Created: 2021-03-23 00:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c77a8da026ec26156ac677281cc2592 SHA-1: e10a2e25c02ef4fd9314a1d36a8ebef909dcf7fb SHA-256: d1f21e1f0326e6b965ee8c29c9eb2d981644983abbdaa27d51aaeb8fae7562a5
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain likely used for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

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://jacksth.ru/award?keyword=faktor+resiko+atonia+uteri+pdf PDF link annotation
    • http://form-lnstagramverificationbadge.com/what_are_some_current_social_justice_issues_in_the_world_todaytmvp2.pdfIn PDF document text
    • http://favosiwuvaru.iblogger.org/worship_online_android_app.pdfIn PDF document text
    • http://newyearshop.site/tecnica_de_administracion_de_medicamentos_por_via_intramuscularhc5g0.pdfIn PDF document text
    • http://life-news.tech/transport_it_idle_tycoon_mod_apk_android_1r5fti.pdfIn PDF document text
    • http://nout-prokat.website/82727595254b9z9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_60174aca9fbf8.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/29374165573.pdfIn PDF document text
    • http://luminar3-download.xyz/994011325407d6yy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_600e75f9d72fb.pdfIn PDF document text
    • http://lisolu.org/asus_rt-ac66u_default_wifi_passwordtkz0m.pdfIn PDF document text
    • http://ryursew.space/do_they_find_percy_jackson_in_the_lost_herogi2uz.pdfIn PDF document text
    • http://vezerfa.xyz/is_white_fang_1991_on_netflixmatvv.pdfIn PDF document text
    • http://vedice.ru/computational_fluid_dynamics_nptelukf5j.pdfIn PDF document text
    • http://usesucre.pro/kubadinefojarubegalovvd0ag.pdfIn PDF document text
    • http://widutojudowixum.22web.org/masagiwudokafunuremoripa.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/sefitowojododanogazipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://torejejowomu.myartsonline.com/konkani_catholic_bible.pdfIn PDF document text
    • http://fokuxukidedir.rf.gd/18684540534.pdfIn PDF document text
    • http://jawuguv.epizy.com/al_furqan_production_video.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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 5020 bytes
SHA-256: b62adbbbae803b2721404c4e6e4854fe08bd1a2f0e1aa16d51de72ae61d515ce
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 11076 bytes
SHA-256: 4ef72f216e5f1ba3f9cc4b684e8bf03787b3492967a09a128f7e99659ada188a

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