Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ddd98ac6d676e8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 22:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 126489fd65691b71da3e6a964c58556a SHA-1: 6f100f33c4ff0f250352c98eb78d90547156de3b SHA-256: 54ddd98ac6d676e87d08d7bf58f1de31e83bed823a07965d21922a668bbaaf2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs that redirect to various domains, suggesting a phishing or scam campaign. The PDF structure and embedded links indicate it's likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=android+app+development+in+noida PDF link annotation
    • http://nagymester.com/userfiles/file/puvudifumazupepidixobu.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/81212249436.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/82289886869.pdfIn PDF document text
    • http://dsagco.com/Upload/file/75044266864.pdfIn PDF document text
    • https://stormester.no/files/file/41411945482.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/98823830420.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/63624435913.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/mupapim.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/31396012352.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/47302775092.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/robamepobudepupazuwiw.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/fatatupov.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/72354364339.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b03219a2e4c97d2beb64938423cc9f26/dutapaxokinotonodizozusup.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/19077237450.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61508086a3962.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16149acdc02bdc---38533023505.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nikoruwudo.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901191729713053.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/kebowitotagazososa.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/59935125539.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/35831839743.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/37562991224.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 10432 bytes
SHA-256: 0c2aad54eec525f6403379f84a4414d730bdada4c509f162bf69ff03d8c5aaa3
font_01_sfnt_off0000c970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 17752 bytes
SHA-256: 60fc19f34fd7b57f4ec3d04716c0635be8764c7671bbda3c8a55f0ba0eb7d244
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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