Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c32ec9c96f87936…

MALICIOUS

PDF

85.3 KB Created: 2021-04-11 11:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 580db3cf065f6aa7908dc6783582ea3c SHA-1: e73e583c45307135d2272975c6528b8fb5ef93ee SHA-256: 3c32ec9c96f87936e44d1e18dc996454c57b40f4e20f402cd12b8e364621e875
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a string that appears to be a search query, likely intended to trick users into clicking the embedded malicious URL.

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://resalured.ru/strik?utm_term=who+plays+the+woman+in+the+mandalorian
    • http://copyright-infringement.business/dragon_age_origins_guide_warriortdfnk.pdf
    • http://ylyn.ru/bandlab_apk_old_versionpn01i.pdf
    • https://cdn.sqhk.co/zasemewiti/8slSXge/12151568900.pdf
    • http://my-credit.info/aerial_hoop_lyra_manualxjggh.pdf
    • http://metazoaapc.fun/linoxataleguq9p.pdf
    • https://cdn.sqhk.co/runudori/jagibih/53121934075.pdf
    • http://intereriia.com/jijimirowimusobekurvc2q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/058b36a2-b2c0-4812-9b4e-2b13cd397d9c/cloud_security_alliance_csa_cloud_controls_matrix_ccm_version_3.01.pdf
    • https://s3.amazonaws.com/zugutixe/html_to_converter_api.pdf
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_81e210f84ad7491babccf5c1ae10741b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5c58279d-a29d-489e-84ff-c7dc12d63b97/genog.pdf
    • https://uploads.strikinglycdn.com/files/0d9911ed-bf87-4823-9ce3-c21c8fc830b3/35991069607.pdf
    • https://s3.amazonaws.com/gelawiweza/jealous_labrinth_piano_sheet_music.pdf
    • https://s3.amazonaws.com/gapivegek/balance_charger_v6ac_manual.pdf
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_322a4576e3904cd598fc915c764de89e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8efacf4a-9a74-4963-8190-19991dd01543/41268224149.pdf
    • https://s3.amazonaws.com/jagux/avoid_n_survive_apk.pdf
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_e96a06ea1cdf4fa69e8b076052edf4f3.pdf?index=true
    • https://s3.amazonaws.com/sakaburepagase/68222835606.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_off00010ebb.bin
902fe7066cb88118b35bc8e68fd5957a7212c2c9e52da57f91a17ff86354090a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 5408 bytes
font_01_sfnt_off00012110.bin
bcdf5827d20cbe2dec5b9cef9dbd6035b162e1ebfdf7e89acde63228f7ead83f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 10932 bytes

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