Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bef34a3155c2837…

MALICIOUS

PDF

64.8 KB Created: 2021-02-23 14:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b92147f972e5c27f84fafa6f373ed341 SHA-1: 212ed2ec6e8e9adfab4b9ec7c0b484a9c38156ea SHA-256: 4bef34a3155c2837ea05264d642c41c14b1d6a2d97cb1a2fbcbb954090ebe4e8
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://leonvi.ru/123?utm_term=zenza+bronica+etrs+focusing+screen'. The PDF's structure and the presence of many links suggest it functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the overall pattern indicates a malicious PDF designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=zenza+bronica+etrs+focusing+screen PDF link annotation
    • https://cdn.sqhk.co/tukutabu/fidRDih/visit_a_city_barcelona_2_days.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/710147.pdfIn PDF document text
    • https://nelejejo.weebly.com/uploads/1/3/4/8/134883178/wigesegabuvajotolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_602a30e882f57.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/gunugulokaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_60004d2791d70.pdfIn PDF document text
    • https://xigobelez.weebly.com/uploads/1/3/1/6/131606473/9616267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_601fb8da206f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_60127fb2f1b1a.pdfIn PDF document text
    • https://sonikimejikelo.weebly.com/uploads/1/3/2/6/132681145/bamaboz-tuvumepivukesej.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/idQgdvI/tasty_town_cooking_and_restaurant_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/senogewuki/hfvijcC/snake_vs_block_game_play_online.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/tazopaju/xadinoxunagojijaziz.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/megevovudikogubupadaponoz.pdfIn PDF document text
    • http://puredaw.rf.gd/autotune_vst_for_adobe_audition.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/history_of_arteriovenous_malformation_icd_10.pdfIn PDF document text
    • http://mesesoriran.epizy.com/jonivukixudobesapanuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/zenenurinupo.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_off0000c088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC088 5164 bytes
SHA-256: 2f591edf04e38d0072ecf9735b522f98a0a64e038b3ee6f2c642a7a22fe53c01
font_01_sfnt_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 10612 bytes
SHA-256: 3265b1acc10e9ab9f8bab4bc32c849ff6c4a8bfb3d9aa130b1404e26c3ec6df2

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