Malicious PDF — malware analysis report

Static analysis result for SHA-256 8527f81546bd4453…

MALICIOUS

PDF

77.8 KB Created: 2021-03-28 13:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62987909d50fc0c0266494dbaf80f6da SHA-1: 7d1af015a55143e246b68bbcd9ad5fbfb4f514d2 SHA-256: 8527f81546bd4453f0b9442b1b901948ecbddae624e014bcbc1ef01146a0ede7
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=what+does+good+luck+with+your+future+endeavors+mean
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/f04c73e584c74b.pdf
    • https://wimukesogizat.weebly.com/uploads/1/3/4/6/134639197/5eaa6e936.pdf
    • https://cdn-cms.f-static.net/uploads/4459937/normal_6035f1d1b6708.pdf
    • http://tulumiv.medianewsonline.com/classical_and_modern_fourier_analysis.pdf
    • http://makebugobiwuka.mypressonline.com/where_to_buy_tv_rabbit_ears.pdf
    • http://bafiselavanebep.mywebcommunity.org/korovaxatowuwazap.pdf
    • http://bivitajuteje.mypressonline.com/65489755660.pdf
    • https://befomunuduti.weebly.com/uploads/1/3/1/1/131164266/9825646.pdf
    • https://cdn-cms.f-static.net/uploads/4412568/normal_6049f37fd809c.pdf
    • http://kamefutebiwef.mywebcommunity.org/95526601010.pdf
    • https://zefulesemed.weebly.com/uploads/1/3/6/0/136021217/2a0bbc.pdf
    • http://terugate.mypressonline.com/18529013226.pdf
    • https://static.s123-cdn-static.com/uploads/4420915/normal_5ffc71f5675a5.pdf
    • https://jowufawogutezob.weebly.com/uploads/1/3/0/9/130969037/najupupe-mosufuvuzadireb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6a1cfb46-9708-43ac-b6ed-9adeaa15b90c/69270141903.pdf
    • http://furafep.onlinewebshop.net/download_free_books_online.pdf
    • http://wiwosotu.myartsonline.com/bibiz.pdf
    • https://uploads.strikinglycdn.com/files/e8fe6716-818e-4a91-8ad0-06812ae25a82/jidavezaxilozagazeromaluk.pdf
    • https://uploads.strikinglycdn.com/files/bfa1f62b-5c8c-43c9-b0fc-f86878568950/xbox_360_cant_open_disk_tray.pdf
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_6804bc1faf7d43668bd0a302d5201e6e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3bba3f4-4f68-43bc-93a9-56f626187519/tuvol.pdf
    • http://najijojovigom.myartsonline.com/asymptote_latex.pdf
    • https://uploads.strikinglycdn.com/files/b621ba6d-2e42-46e8-9fe0-88d6a034406d/pategawozewidog.pdf
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_e1d4e98e0c814a6093dcf65322b69c97.pdf?index=true
    • 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_off0000efb5.bin
7322109dfc6649283d9d6bfe13d2e74735ce0e2749b5797bf6f771336032f8e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 5768 bytes
font_01_sfnt_off00010355.bin
9dc01792b6b588e7f069b0013131db3158be572bc4c157b0104f2e4fa4dc3f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 11188 bytes

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