Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9b177df3ff574f…

MALICIOUS

PDF

80.2 KB Created: 2021-05-05 21:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8e0349a81d7a6183e484d53a9578688 SHA-1: 82c7264777449415ccbbcfa636a94724736fa5da SHA-256: 4d9b177df3ff574f0fa9f6d8af96cd98f4bb964e80bf8a05236fc45a7d58be99
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain ('seumenha.ru'). The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=what+is+the+role+a+species+plays+in+an+ecosystem
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd651e38f6a2.pdf
    • https://cdn.sqhk.co/liregevo/Ijajajd/apache_web_server_for_ubuntu_16._04.pdf
    • https://cdn-cms.f-static.net/uploads/4369926/normal_606b87d829a6a.pdf
    • http://faxusigeroles.sportsontheweb.net/92837785031.pdf
    • https://cdn-cms.f-static.net/uploads/4379380/normal_6013ca9066b5d.pdf
    • https://cdn.sqhk.co/danajuva/Iu0jghb/wevinenatepus.pdf
    • http://tranquils.space/gevalia_free_coffee_maker_deal2ys49.pdf
    • http://sibatike.getenjoyment.net/ordinal_numbers_1_100_in_odia.pdf
    • http://wiwajekirutiw.scienceontheweb.net/pofuselizawi.pdf
    • https://cdn.sqhk.co/muluxodipoto/h6ge2LD/87007887559.pdf
    • http://pukujadud.getenjoyment.net/calorific_value_definition.pdf
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fd39a107f04d.pdf
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fde671482127.pdf
    • https://cdn-cms.f-static.net/uploads/4368751/normal_604b0146630cb.pdf
    • http://cleanup-sale.site/munosarudedererabarojlzjbg.pdf
    • https://cdn-cms.f-static.net/uploads/4459320/normal_605bc24f18ea5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/530cabe8-c871-47c4-a7a8-e0db76d3da78/line_6_pod_xt_pro_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/659fcd3b-37c3-4d37-83b2-00e98d1c6f6a/how_do_i_reset_my_bosch_avantixx_washing_machine.pdf
    • https://uploads.strikinglycdn.com/files/6013a22f-2847-4a9f-b341-973379ddf0fc/sopinaruviwol.pdf
    • https://uploads.strikinglycdn.com/files/5ae210bc-634d-44ca-8754-9c8825faca49/five_nights_at_freddys_song_roblox_id.pdf
    • http://jitawidavez.atwebpages.com/24312382550.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f729.bin
86ee48d0f2c7e7791866cb66320609e93097ae88a7e93f498d23f4f4f1adc3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5288 bytes
font_01_sfnt_off0001090d.bin
57ef3a7e7b9de30d13bb6dcd3d202440607a42b167e383ee85836ed0d0f9eafb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 11716 bytes