Malicious PDF — malware analysis report

Static analysis result for SHA-256 c541cdda8009749c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 15:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1110cdb6714886831b9a8c8d24e4a154 SHA-1: 929ec2af8bacb50ed875b5195d57d58685583d26 SHA-256: c541cdda8009749c882aa88c166afed794c791edcf6599e4832ca3717e629923
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=android+disable+ad+tracking PDF link annotation
    • http://portaldo.eu/contenuti/upload/file/38091307745.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/29740652776.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/zigivetig.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/zavesip.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/17235492380.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/40709319550.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/8108485258.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kituwuvotufusem.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/sedemezukutewomoni.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381c03dedd---jofepenojezajulove.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/48212684907.pdfIn PDF document text
    • https://davaocarrental.com/images/file/90944887383.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/zarijunubi.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/24132678275.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14976093827.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/13991739234.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210902_29eed.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/bonopizesufapet.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/guruganokilolatun.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/gemexakusoxulojon.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/lilavolevezezadamizi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/bituruvomebiteb.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomumasezekufojadigojomu.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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 10756 bytes
SHA-256: 5fb6f08d5ea596f6e6ea0fe0f5a1c2de215ef0a383a801e5bb439468d8d0ab85
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16964 bytes
SHA-256: 04c04dad69ea7e5e3510b6d5d23c03d1c12a2bb4a6ee3c2e0b59c13f06e6500d
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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