Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f63db5c00e6b3b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-31 20:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ee29faac462119b0d0e8b2fb0e5c686a SHA-1: b2186c4f82336ec4e38855bf63277bb8e1387145 SHA-256: b9f63db5c00e6b3b4d9d2f7204aa6973c2e5fcc3d66b4f9d967992d05c029c21
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'gimoguvi.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=light+pilot+on+water+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476272/normal_600e6e802255d.pdfIn PDF document text
    • http://899themes-demo.ru/woodworking_classes_san_diego_community_college2kyr1.pdfIn PDF document text
    • http://gedozudusinap.mygamesonline.org/59333763052.pdfIn PDF document text
    • http://medtechnika1.ru/wovetifexofomucf27u.pdfIn PDF document text
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/8a7e9ad24e65a8.pdfIn PDF document text
    • http://load-bcp.com/storm_silver_ingots_blessedrj6nl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_605920cc96e8c.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/twilight_saga_breaking_dawn_part_2_soundtrack_download_for_mobile.pdfIn PDF document text
    • https://naleletilasimoz.weebly.com/uploads/1/3/0/9/130969891/7444833.pdfIn PDF document text
    • http://familyit.pro/88655742061z5162.pdfIn PDF document text
    • http://oneitstore.pro/percy_jackson_disney_plus_cast_calle7ld2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_60463ab5455c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bojepudadadax.atwebpages.com/occupational_health_and_safety_standards_philippines.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/33378050050.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_2b443e0557084f8ca5b5485361c03621.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_8fed634ca7c640ed97822a6cac63541c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84eb66c9-bda3-43c0-8a01-d7a98be37cd5/wefipoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7836e92-3601-4aaf-abd8-965e45bdad3c/67024365595.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_7b26dc64364c4098b73bd8cc9e838919.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51299363-8fd3-43e0-923d-f08bd93b4fd1/bagasedi.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_88a9afbb687545efb343c97d2eaa5a9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1dc2a4-16cb-4ee5-aee2-e55ac8ab0a26/43780943246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a9cf46-2902-448e-b049-4b2eeefc28a0/juice_cleanse_recipes_for_fat_loss.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 4724 bytes
SHA-256: ccb5e6fdef4658a80d19d568a98f25cee1dc05000a9d80a7ce23ac11ccbdd753
font_01_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 10944 bytes
SHA-256: d5dbc28258bd57299ce25268678ad153c594cf325e386d493cd2e81f49067ce1
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361