Malicious PDF — malware analysis report

Static analysis result for SHA-256 728e42230b67e21d…

MALICIOUS

PDF

73.0 KB Created: 2021-03-21 00:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25301133efab86c0fcbb9d96a3a2dc8e SHA-1: 2f9a0ec89301ceb8f1c25bf02ac71a41ebc4f383 SHA-256: 728e42230b67e21d70be7bbade14a6f319a47273969657f9f3819bb9407577a0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=agario+hacks+free
    • http://mimudobaros.22web.org/algebra_2_common_core_textbook_big_ideas_math.pdf
    • https://cdn-cms.f-static.net/uploads/4370307/normal_60181957be125.pdf
    • https://cdn-cms.f-static.net/uploads/4380694/normal_602c0b07c840f.pdf
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ffb8be43a394.pdf
    • http://vuzuwul.getenjoyment.net/samsung_tv_ir_sensor_not_working.pdf
    • http://polanuredun.iblogger.org/surulan.pdf
    • http://rigovutamejebum.iblogger.org/halfords_automatic_battery_charger_user_guide.pdf
    • http://gowanenutik.mypressonline.com/reflux_moonshine_still_plans.pdf
    • https://cdn-cms.f-static.net/uploads/4410965/normal_60280b43918cc.pdf
    • http://tokepubex.getenjoyment.net/37198826344.pdf
    • https://cdn-cms.f-static.net/uploads/4469378/normal_604fc0a25f923.pdf
    • http://gumugupibope.iblogger.org/xirekunexiperowabokopaxon.pdf
    • http://xapiduxirob.mywebcommunity.org/agenda_2020_20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://voxinuxo.epizy.com/complex_amalgam_restoration.pdf
    • http://safamulidapi.epizy.com/wukokefosibegisosijakixaj.pdf
    • http://lebevinawefebo.rf.gd/steelers_injury_report_week_2.pdf
    • http://todiweluwazem.epizy.com/75483778615.pdf
    • http://xawoforusur.epizy.com/hatsun_curd_advertisement_music_free.pdf
    • http://zoniguzetixan.epizy.com/kvic_biogas_plant.pdf
    • http://wasofiwomorap.epizy.com/40727754068.pdf
    • https://uploads.strikinglycdn.com/files/73a6e7f0-22ad-4668-99ce-ef4e07de7f1f/garmin_gns430w_data_card.pdf
    • http://vatikob.epizy.com/jenavunoxalow.pdf
    • http://letulirabe.epizy.com/bucaneras_de_cuero_con_plataforma.pdf
    • http://robopawize.epizy.com/makajiretuse.pdf
    • https://uploads.strikinglycdn.com/files/48c79597-76db-48e2-8f38-51f75108a5af/vapugawoweregugim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc45.bin
35fbb30842205cb93b64880f985f48b404fea0d1d2569ea67b19457c021538ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 5164 bytes
font_01_sfnt_off0000edd8.bin
f71a89fdd95e9cbdd7359140c16ff314f4e426451984748504d93a5604b54097		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 11388 bytes

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