Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03f20c1e914c1f4…

MALICIOUS

PDF

78.6 KB Created: 2021-04-14 19:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ab546d5237532125776de59d0dfecab7 SHA-1: a86c2157bd76a5cc99fed5aa5d49a47c1959c04e SHA-256: c03f20c1e914c1f46073c704186d42527d60d8ff844dbaf577f3c0de9ee585b5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with a prominent one leading to 'gimoguvi.ru'. The document body, though heavily obfuscated, contains text related to 'the lying game movie cast', which is likely a lure to disguise the malicious intent of directing users to the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=the+lying+game+movie+cast PDF link annotation
    • http://doxedisipi.scienceontheweb.net/kibovijenesifumawodexewe.pdfIn PDF document text
    • http://jijabewifomemab.iblogger.org/69537039696.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/why_is_my_galaxy_s8_not_connecting_to_wifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_60530eb6b2b47.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/76413112854.pdfIn PDF document text
    • http://ridunculus.com/james_stewart_calculus_6th_edition_solutions8kf5r.pdfIn PDF document text
    • http://daliadiago.com/6871410727997bvo.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/monopogipev.pdfIn PDF document text
    • http://janusadow.mygamesonline.org/demesefuga.pdfIn PDF document text
    • http://profaudit32.ru/41788600560fkmwt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_603651c5bd39f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavibajegis.onlinewebshop.net/caia_level_2_download.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/nomepakosado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b2a0dd-ab9a-44de-a4d2-f0430077c8d6/binomial_probability_distribution_definition_and_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47bd043d-02d7-459e-b11f-419b39d77a48/briggs_and_stratton_500e_series_parts_manual.pdfIn PDF document text
    • http://zozupajekuledus.myartsonline.com/42181399307.pdfIn PDF document text
    • http://fategag.rf.gd/back_to_school_shopping_list_template.pdfIn PDF document text
    • http://zedofizanotigip.epizy.com/2012_chevy_silverado_lt_specs.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/85034566654.pdfIn PDF document text
    • http://fewakemuwu.epizy.com/82194913677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc799c63-18b7-43da-b030-53644816e435/manuale_istruzioni_casio_g_shock_5081.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_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 5228 bytes
SHA-256: dcdc0ecb310864b796fad7e45f2b90ea30fb588066372972452ea066bbf00d1e
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 11320 bytes
SHA-256: 561bfc3542c38fc36046cd604b3cb8f92c8feb868243cfb6834cf0d6aec0a577

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