Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cd14e075421bdd…

MALICIOUS

PDF

90.3 KB Created: 2021-10-09 09:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bd52cecd1ce5fb6d316aef1f9a63698 SHA-1: 5550dc6329dd62143b3d6a9f2b238e652bd972f9 SHA-256: 26cd14e075421bddfc2f9cc4cf4078f429e7d02913f45d1acf13d2e0518b0ef6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://medvor.ru/uplcv?utm_term=mad+town+winter+edition+2018 PDF link annotation
    • https://jck.ro/userfiles/file/83716015854.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/23172174719.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/21251811932.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/53112407238.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/lemalijisevapezekijabe.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/masemus.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/615f5a695c251.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5a3a43787933a322b2991d67f51175fd/zuduwujozofaninisuni.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/wukisaponapetarawopamizu.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/nufipujik.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021925613484163.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/87vpjrmjdhbi1c31jp1cgre293/82389034008.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/vitowazenipafirumasis.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/dugafuxuset.pdfIn PDF document text
    • https://ka-base.no/images_students/files/29700507057.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/88614989181.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/32609464171.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/pezutaza.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/tugilinigotipide.pdfIn PDF document text
    • https://krossi.ru/images/content/files/37947529623.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/98654677607.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/69760254451.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/kajepunapu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 10608 bytes
SHA-256: e86560043fb96234ac4c1c9dceedf8ed656e6ee795a53f9d41091c8e03ad95dd
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 17380 bytes
SHA-256: a74c10de31592c1002bfe2cde1afc40e81293add75c577387ee47cb9c1338d78
font_02_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 18664 bytes
SHA-256: fa5339fcb8d0652596f9c09a458cc899b88d6001a7b9b86d52d3971e5515edfa

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