Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f22ff8503b861c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-11 06:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcdfce386795daaecc5da2bcc28f868c SHA-1: 959dcd1f47591e9efef63fa275079f8a14a7b694 SHA-256: 86f22ff8503b861c71345abb45fbd3447d91c85d031be34c659c20a8a31f63d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. One of the primary external links, 'https://leonvi.ru/wix?keyword=n64+mouse+for+sale', suggests a lure to attract users interested in specific items. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

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://leonvi.ru/wix?keyword=n64+mouse+for+sale
    • http://dvertsoff.ru/badumum4thki.pdf
    • http://organicnu.info/pexoxizegepuzofadopegiw4vrn.pdf
    • http://lalashoppen.online/gevelujidixu1ld7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_d024b441e2d84f51bcd3f3d01ec1a787.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5efd5cb-ba24-4e89-a2fd-4618773ba189/how_to_name_simple_binary_ionic_compounds.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_811d897248c44c4f9b3c722164e19d93.pdf?index=true
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_b60fe5193e1243eb84c6d11d0c4765b5.pdf?index=true
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_fa2f7709430244318247e69f2c269435.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cba47c73-8468-4638-80f3-6bb3cd64be3e/what_is_the_best_way_to_transfer_vhs_to_dvd.pdf
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_659f9cffe2a246e7b98ef18559c91c7c.pdf?index=true
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_37e8d5e5f5314ba793312608ad7efafb.pdf?index=true
    • https://s3.amazonaws.com/zubuwujoxom/gapor.pdf
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_51d5727f8c2b4614af805fc73f408fd1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4368c2d5-d9f1-429c-86dc-50c18af5848b/9301765757.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_ca6d91f09b8f455db04d987556ee6348.pdf?index=true
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_1c288a8c5c89433a9adc45b76ecca6bf.pdf?index=true
    • https://s3.amazonaws.com/xetasif/algebra_1_pearson_book_answers.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_off0000e7ef.bin
5e62c28c345a61008755f39ee3d2ef8dc44f213184d3fcb9d1ac695a88dab2be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 5124 bytes
font_01_sfnt_off0000f94c.bin
09d3f20207e3b33cef6bc710e7b2be65c56d98afd3fa7b3ef87267c437546fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 11352 bytes

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