Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d2e88b862bd733…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 14:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc1e80b9eb2491994244fcd8caa56e1b SHA-1: 6f29ac0e3fc91662925e2dd98a42e4833f7a6d21 SHA-256: 01d2e88b862bd733b039b1509a01b8309d5b929ca2d18cd29f6998e7c1cd13ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=beatles+birthday+sheet+music+pdf PDF link annotation
    • http://cupta.org/userfiles/files/20210905075016.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/36641681083.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/24405031029.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vevolinebizeza.pdfIn PDF document text
    • http://napiarsaigh.com/images/milofisijabu.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/lopezimura.pdfIn PDF document text
    • http://delve-cr.com/uploads/35491245452.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/13608906384.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vuduxutakisojufadulamo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/44275926429.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/72605109100.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/88256323135.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ghb5u58olcdntar0nsnh9mcfc8/zupexos.pdfIn PDF document text
    • https://dintek.eu/uploads/file/duzarumodugonevofapowisi.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/88815190145.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/17902196520.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/73394624316.pdfIn PDF document text
    • https://agatanorek.com/files/file/xolopitadixikikeditav.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320b27ca015---85126994142.pdfIn PDF document text
    • https://tessuno.com/upload/files/612fabff9f614.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/katigepozetofek.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/58674169284.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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 18160 bytes
SHA-256: 5d96f2bc735b3077bf02ebfca272332e2b7a0c41289323ff7ba5399aa2b2a341
font_02_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 11068 bytes
SHA-256: 66be1456c23276e97f02c17159260c1361af5cb43e383c23460006e13aab1bba

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