Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d22930482f62864…

MALICIOUS

PDF

81.9 KB Created: 2021-05-16 14:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258809c56f6dd1418e8771d2bffb1c83 SHA-1: d01e5bcbf36c8521af39c622ebf2fe629ec11d52 SHA-256: 4d22930482f62864de4b009b3549e10e2e4046a42edb7f82bd133d8aba3246a1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=singer+fashion+mate+5560+bobbin+case+problems
    • https://cdn-cms.f-static.net/uploads/4416934/normal_605d86608b5a4.pdf
    • http://dakisemakegag.sportsontheweb.net/ninebidalisirenaposuk.pdf
    • http://pigigozoruda.mypressonline.com/almanaque_turma_da_monica.pdf
    • https://xiresipi.weebly.com/uploads/1/3/1/1/131164504/xoxenejenimur.pdf
    • https://jimekijan.weebly.com/uploads/1/3/2/8/132815057/1877201.pdf
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/zetiwekedor.pdf
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/todasigajuji.pdf
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/xujugav_vixud.pdf
    • https://cdn-cms.f-static.net/uploads/4471509/normal_604ade80ab925.pdf
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/3450562.pdf
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/7b22114e1.pdf
    • https://wigobozigor.weebly.com/uploads/1/3/5/3/135345973/rijekagetapo.pdf
    • http://mizafaroremida.getenjoyment.net/76406328464.pdf
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/punumomudinaru-gugopodewizife-xuturibefo.pdf
    • http://manibupefif.mypressonline.com/always_look_on_the_bright_side_of_life_lyrics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://megigezorozo.atwebpages.com/67649681785.pdf
    • https://uploads.strikinglycdn.com/files/242e9451-94ce-4b2f-8be0-db594070c83d/26474402523.pdf
    • https://uploads.strikinglycdn.com/files/81102e44-fe5f-407e-8dc6-c51706966141/72832600969.pdf
    • https://uploads.strikinglycdn.com/files/6abfe03d-9f93-414b-9a81-a28e33d0dd23/how_to_overcome_dysarthria.pdf
    • https://uploads.strikinglycdn.com/files/bcd10e19-d905-4836-938d-810d54f0933e/fujimagamazo.pdf
    • https://uploads.strikinglycdn.com/files/9ceb97f2-2380-42f1-99ea-76755ac0cd1e/73022179113.pdf
    • https://uploads.strikinglycdn.com/files/c0f151d7-aabc-4b55-8207-9bc4ae8cac08/bozepulodojurus.pdf
    • https://uploads.strikinglycdn.com/files/de54cb4f-d902-4560-a2aa-034769ebf369/82673231897.pdf
    • https://uploads.strikinglycdn.com/files/7d23cd12-2d49-4ef5-ba07-307fc8e2c3ec/fractal_fx8_vs_helix.pdf
    • https://uploads.strikinglycdn.com/files/b8c43917-6370-44de-8a07-9402cb915432/what_is_the_main_objective_of_management_accounting.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ec.bin
fee7243e66f8f9e3e6bd4dabb6ec452a6afc3e983902b166c4e55c6344073489		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 5880 bytes
font_01_sfnt_off000106b1.bin
788f354af3baa46f33ef7bb8374bad7a1a59ca382315df823263f1f42a058b7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10316 bytes
font_02_sfnt_off000129e3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 4324 bytes

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