Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5383c13d7479bd…

MALICIOUS

PDF

83.9 KB Created: 2021-10-09 00:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fe678646008c9bda9557e6c7fb2d14b0 SHA-1: 1dd8bc012bf648087f23879d58f6698d85b6ef39 SHA-256: ff5383c13d7479bdba2b0acfbe16753d18a0418164f171100ef5a6eafa11d98a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to suspicious domains, suggests an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hasanmasat.com/ckfinder/userfiles/files/49999784057.pdf In PDF document text
    • https://heart-calligraphy.com/uploads/files/202109032256431098.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/daretubadabojefusulas.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/masinilipedexeronob.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/20602357036.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/81244514315.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/92562413678.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/46897584712.pdfIn PDF document text
    • https://sopkambing.com/contents/files/roluteworakerafudaletutel.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/92288350074.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/82958072091.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/jegogikotijekefagi.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/22183495653.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/3227930650.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/22662586977.pdfIn PDF document text
    • http://4bx.pl/public/file/69673270533.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jl2vidpljpchai0rqjkc83m9v5/zefajalajurexozajaxat.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/nigisexijexinusul.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/14043463200.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/37091158753.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/bejepabejum.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/tipikinof.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20211001132817.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/fakobesuwipozixuxije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+happy+prince+drawingPDF 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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 10524 bytes
SHA-256: 75e0d75ea7a813da9802ce4908d8f780e011b07d89d76f2490c703ed6b7ac737
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 19508 bytes
SHA-256: 59b48feda004eed3051f9701af6591cbe91da63fa4c2b24f61775fe397982a7f
font_02_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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