Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b5027b6c106b33…

MALICIOUS

PDF

72.6 KB Created: 2021-06-02 14:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3ad0b38c0f2b812aeed0265b16891ab0 SHA-1: e420ce932bd140f96045b3a77999670b63bf89c1 SHA-256: 11b5027b6c106b332f8b4946c1c2e1f6382b7d6feef89ef0ccde2bf8138614d6
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary focus on redirecting users to `https://xajibur.ru/wb?keyword=cuales%20son%20los%20derechos%20humanos%20en%20argentina`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` suggests the document is part of a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8043

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
  • 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
  • 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://xajibur.ru/wb?keyword=cuales%20son%20los%20derechos%20humanos%20en%20argentina PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415964/normal_60283e5183ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_6065d81fa40e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_6024517f29d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_6026557f131d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_605a70488890f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_6010b6bcab828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_5ffe885fce248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5fd7b1b32cbdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_60303fc963e56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144447642/what_is_the_next_v8_supercar_race.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdbb472-1b58-4487-80f2-90fc94bcf397/does_garage_door_remote_have_batteries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb22aa7d-68df-4628-b75e-fd03c0cf8cdf/software_architecture_in_practice_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e95ea9-4ef8-42ae-a647-d3a5bf5f4c26/tevubarufup.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/40271918160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb12745-c70e-4450-be4d-8b9ffaf61f6c/zawemokobalasisaposigiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d52df60-cee6-4695-9929-ca41a93861ef/56534017507.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/download_lagu_kokoronashi_gumi_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a42d1d3-bfcb-46a9-8b28-7cd5b3d6b143/tubipumogofavi.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424647/14470124712.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/how_to_prevent_trapezius_muscle.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 5260 bytes
SHA-256: d2daedc49dcd4546edf0b1b81c43299dcc0ee99c8eb23b6a5c4d549c8b8fc475

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