Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d908184162f6db…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 01:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f8e0175ac05feca4c0e29b3d904758d SHA-1: 26558be11fd1d99d3dfd8c1210f75ba25247e0e9 SHA-256: 91d908184162f6db050c578fe3b52b4a927de62675b76a9f0ffae59b989165b8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with phishing lures ('gimoguvi.ru'). The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics further supports this, suggesting the PDF acts as a gateway to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=examen+ceneval+medicina+pdf PDF link annotation
    • https://cdn.sqhk.co/sumavevop/3hineGX/extreme_landings_mod_apk_3._6._9.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/foEN2gg/w3schools_javascript_function_call.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/sazerajosijipabesani.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/wgjZhc7/86805056112.pdfIn PDF document text
    • https://cdn.sqhk.co/xegogeji/SjdjflD/5718858344.pdfIn PDF document text
    • https://cdn.sqhk.co/muwunupudi/4kYMiax/3153002215.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/almost_is_never_enough_partitura_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/Hcgeszh/rugotogeropakij.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/Wggijjb/carrie_underwood_song_lyrics_quiz.pdfIn PDF document text
    • http://kexumojazo.mypressonline.com/bomerunagelow.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/icIsoMT/64948389474.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/1R7ijhe/struckd_3d_game_creator_apk_download_uptodown.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/homeless_life_expectancy_uk.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/vavabi/what_to_say_instead_of_its_okay.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/general_topology_and_its_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/68479961036.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/labimudesi.pdfIn PDF document text
    • http://gafodix.myartsonline.com/python_convert_ip_range_to_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/best_bollywood_movies_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/67019772634.pdfIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/mac_os_x_quartzcontext.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/adagio_for_strings_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/picture_collage_maker_pro_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/follow_directions_worksheet_5th_grade.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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 5112 bytes
SHA-256: 90fcdf140bccd40329b76e3c604713d5842e42306560630525fe39dc785d3b6b
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 12352 bytes
SHA-256: 5c46fd8a96aec3412ec3ce2cce4dff29ffe2933f3123bb2f41a28172bf9069ad

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