Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d8ae16145e2e05…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 18:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03297431df66ee878abce3460afdb3eb SHA-1: 7883826e36b234841c9be82bd5db33fa607b3825 SHA-256: a8d8ae16145e2e05dae0e80797538166f815ccd162d957aa7955dae700aad37b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://andlupa.com/userfiles/file/48429485232.pdf In PDF document text
    • https://tlproduct.com/userfiles/file/65832404875.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/99106136581.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/bezaj.pdfIn PDF document text
    • http://rnralpha.cz/res/file/69951231792.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/mipobevabijifosu.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xoziwinolozedulitok.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/22820371165.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/90526773981.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/dapanalonovujenadegemagor.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614813d61b5ff---jonesoxodusu.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/10463185143.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210916185740.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/talozifuvoziv.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf489c797---zewidonimotenigumezasozel.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/teladisetitijage.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/dexinetagabufajogati.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/24300628774.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/64071370468.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/dirugofodaradivowojod.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/puvasemok.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210902235044.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/sonulus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=muss+man+f%C3%BCr+whatsapp+zahlenPDF link annotation
    • 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_off0000ba8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8A 18428 bytes
SHA-256: 3cd85bd45aac576734bb8f2f3268afc84dfea2d2077ee22cff5d489ff9d4569f
font_01_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 10844 bytes
SHA-256: 3692d7d3eeaacf84416b1608cb34803e12b0d17f6f70c7a698fb2f552a319000