Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd56641427255d6…

MALICIOUS

PDF

79.9 KB Created: 2021-03-05 15:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4b01ab1f875467270b9acce856fbd819 SHA-1: b6ab2d5e014dab435eeec36034a662218047564b SHA-256: 4fd56641427255d638ed95d106574378f4fac5023e9d481d88cbddc2b68d6767
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain ('mezovuduw.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=phrasal+verbs+with+get PDF link annotation
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/5354490.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/sezadikupuz.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/mastering_the_art_of_french_cooking_volume_2_recipes.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/1834021.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/b3id5gc/that_s_you_meaning_in_malayalam.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/does_silk_really_help_hair.pdfIn PDF document text
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/8390295.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/zatewalovipisosujepobebas.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/34541733883.pdfIn PDF document text
    • http://dokojekiferej.mygamesonline.org/41330082010.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/rCIhdhd/62847632289.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/new_country_rap_line_dance_songs_2019.pdfIn PDF document text
    • http://help-copyrightservice.xyz/rick_and_morty_episode_list_with_descriptions48l63.pdfIn PDF document text
    • http://oneitstore.info/resucito_cantos_del_camino_neocatecumenal_2020akmyv.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/ibw9Bgc/88894028419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noratev.myartsonline.com/yaskawa_a1000_alarm_codes_66.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/vubebasirilusadolato.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/project_timeline_template_ppt.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/primerica_insurance_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/internal_audit_template_iso_9001.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/bass_clarinet_jazz_solo_sheet_music.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_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 5240 bytes
SHA-256: 4b9539a5bed391007bd2c1f339dafa2f37009f2836dd712b47f61bc27fd495a4
font_01_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 10728 bytes
SHA-256: 341643f60de8cf2a135a11a811a9d30bdf1dac948f4c7eaaf291d99dd3546483

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