Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8434639626f275…

MALICIOUS

PDF

79.8 KB Created: 2021-04-02 15:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 531abc33af91cd7c03b25db156d98961 SHA-1: 0f595c3de2f14a566e3efb4dd7c0d9c8b3a4d46f SHA-256: 6b8434639626f275bf90a1c9e1251850dc7e6d24722049b6ef70de40e75de474
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The embedded URL 'https://soxebez.ru/strik?utm_term=dell+e5400+won%2527t+turn+on' indicates a lure related to a common technical problem, likely to trick users into clicking through to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/strik?utm_term=dell+e5400+won%2527t+turn+on PDF link annotation
    • http://xexisutufas.iblogger.org/26555097409.pdfIn PDF document text
    • http://kiwirixup.22web.org/32749383456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lirepotinemos.rf.gd/94591302324.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_8d96fd70ac8f4080a4ee44c793fdaa0c.pdf?index=trueIn PDF document text
    • http://jumirasex.epizy.com/90012884100.pdfIn PDF document text
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_053fc8496ce74175ad20ad7e7f96c0aa.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_cb6f548270884b3d9a90dff5c4905a39.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_0253c5a4e9e74924a2df833a38f094d6.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_b16ae490fd494a9da8d136b167815fd2.pdf?index=trueIn PDF document text
    • http://kakarares.epizy.com/animism_religion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad4530d-6242-4b66-a078-6701d4b75f10/left_behind_audiobook_1.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_319499a5fe51425aad71c3f1068992b0.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_91b22423b902432883aba9e0bff1d925.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95588103-14d2-4393-8347-a418aafd38e9/64681871249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9626f9f-cc1a-4878-8e7f-23d1d6cdfcfa/62512932758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a490221f-7fd2-48db-97d5-2513f0ae7f2d/gakomovaregejegiv.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_38b3915d0a1b4ce588137b45434b8adf.pdf?index=trueIn 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_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 4768 bytes
SHA-256: 99e4de83bf977e632e4c5f0a6692d3de1ea1a084f71f204f583440df1c84c75d
font_01_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 11580 bytes
SHA-256: 54c2d2192f80a03a020efcd52e1b592e20cbf72faf3915c82dcbb0f5524d4049

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