Malicious PDF — malware analysis report

Static analysis result for SHA-256 e059926cc2cd0cdb…

MALICIOUS

PDF

80.5 KB Created: 2021-03-19 12:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8d74efa3bccb3bf255a3922d667f5f0 SHA-1: d0fe75d37b65bd89ff873d5f157a04cf66259ede SHA-256: e059926cc2cd0cdb74b66faf7a789376283ea31b40e30a20b507f3be9e30ca34
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, with 'https://midufefew.ru/award?keyword=armadura+de+dios+estudio+pdf' being a primary example. This pattern is commonly used for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=armadura+de+dios+estudio+pdf
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fdb9d656b762.pdf
    • https://cdn.sqhk.co/feluxolid/cjrW6wa/jimajase.pdf
    • https://cdn.sqhk.co/tapowifilez/hhWgjst/63381440317.pdf
    • https://cdn.sqhk.co/xewafazuk/xk4jac7/62963115744.pdf
    • https://cdn.sqhk.co/filovosa/Fshdjdl/zedge_app_download_play_store.pdf
    • https://cdn-cms.f-static.net/uploads/4379032/normal_600a8f61519e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://toririli.rf.gd/national_lottery_draw_history.pdf
    • https://uploads.strikinglycdn.com/files/077a2d0d-1a76-49ed-a197-28e78df3bb5e/amscope_microscope_case.pdf
    • https://uploads.strikinglycdn.com/files/d4cc2e6e-e1be-4024-8af4-fbfbde026912/huffy_44_composite_portable_basketball_system_manual.pdf
    • http://javozajesaretu.epizy.com/rupelutodujelusafogaj.pdf
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_290bf1d4e5364d548a76759ffea10098.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1dbd65b-a6e7-4c49-8a7a-88bd3ac4e518/smith_s_marketplace_bountiful.pdf
    • http://fofeparulofiz.rf.gd/java_7_update_45_oracle.pdf
    • http://zabukek.rf.gd/echo_srm_210_weed_eater_manual.pdf
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_f11eacf69dcc457bbbc1155a95d3ce76.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0684f1d-d93c-4e11-a2ba-8ad1045f65bf/what_are_some_good_reading_questions.pdf
    • https://uploads.strikinglycdn.com/files/03f33a96-748a-4362-9dbe-342b2ddb453d/what_intermolecular_forces_does_ch2o_have.pdf
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_026c7f28d7e24ef0a14580256320d931.pdf?index=true
    • http://zizaminejif.rf.gd/61684923464.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee69.bin
f71e44649182e26c4b42cb4f67e3807877966d4c0f1784124b0be0042ef4ca79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 4920 bytes
font_01_sfnt_off0000ff22.bin
31c280f561ae73afdbbc481373f4167841098fe77b832388099a28cd0429a8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 11852 bytes
font_02_sfnt_off00012557.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 4324 bytes

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