Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf482f85d30e465…

MALICIOUS

PDF

66.3 KB Created: 2021-04-03 22:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b552694804e98d00cdbd8c086c394b99 SHA-1: e8a121f3de89a2ba049f380bd626156b304f3cea SHA-256: eaf482f85d30e465e2be0cf09d5162de343cdfeb2f6fb2e03c37007edcfae088
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('maypoin.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous PDF files, suggesting a coordinated effort to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=collins+english+grammar+and+composition+class+3 PDF link annotation
    • http://latujajugudewum.iblogger.org/madufetugaserubawoletad.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/81347582510.pdfIn PDF document text
    • http://creditscoretracking.info/mezefodw9u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5ff0740120080.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/regikevoper8km9.pdfIn PDF document text
    • http://telitogivel.iblogger.org/the_anarch_dan_abnett.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5ffe879e5fd52.pdfIn PDF document text
    • http://trokot-tonirovka.online/55220688509geae0.pdfIn PDF document text
    • http://save50it.pro/zafejitixelolj8672.pdfIn PDF document text
    • http://groshyk.site/altered_carbon_season_1_episode_8_wikiucgfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_6020719d91296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_60282908d88d9.pdfIn PDF document text
    • http://febefapowe.22web.org/rewuvuwesazasasasisatev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_6044950a6c834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxurulokij.epizy.com/causas_de_las_autolesiones_en_adolescentes.pdfIn PDF document text
    • http://lipuwetaw.epizy.com/sims_4_patch_notes_december_2019.pdfIn PDF document text
    • http://muzirovun.epizy.com/nouve_biotin_bula.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_378359de114340a2b4422d489e5b233b.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_ee6110f92e7c416e94dbea415910fda7.pdf?index=trueIn PDF document text
    • http://navibizo.rf.gd/bee_buzzing_sound.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/elitebook_840_g1_spec_sheet.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_off0000c657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC657 5556 bytes
SHA-256: 4e8cfb0c98f639d3026d27ce4d626fb2bdfc532b69d38ff8355bf86fbc8c5590
font_01_sfnt_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 10144 bytes
SHA-256: c85c716bc746b9f6f79e840212ff952172c0990e37e34154365fc6614ed8325b

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