Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2628b3488aa5f2…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 20:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d8f62acd87f0a1898da0d162118cfea SHA-1: 10d1b882a5eba00027a8883038d3a5989f577241 SHA-256: 5c2628b3488aa5f212d376cbc4e8d2b3ed51fc7a8904cbb94984de54d1dcd74d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicative of a link farm designed to obscure the ultimate destination. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rh-h1tapi-turbo.com/contents/files/62584281695.pdf In PDF document text
    • http://aygroupmuh.com/image/files/gebuduv.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/fuporeputuxunezovujoke.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/90660573748.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/xavagezavodopigufof.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/palubulujogajin.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/22488078695.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/75985544477.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/jefemesurisogujuduruv.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/sopusegipesefewuraxim.pdfIn PDF document text
    • https://onlinendttraining.net/files/41081587693.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/12282441299.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/9121039547.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f00da287f3b6f8a73d16d54bc6aa12f0/49980710236.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ef74523d909cc4ed0df1de1fb168cdb6/zowatixikudepimogawibi.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/65056442740.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/55765220239.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/neguxukuniguwejuvejizux.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/wobanuretexix.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dulalefugaveg.pdfIn PDF document text
    • http://edeins.com/userfiles/file/38770058205.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/dibikeburufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nba+2k21+android+arcade+editionPDF 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_off0000c638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 20972 bytes
SHA-256: 58acc68948d9ba506fdde83aabd40a1996ffdd6416d4631854ac68ea74a2d433
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10532 bytes
SHA-256: cfdc93d51ab3f06707c25fbbf3d45336d160bcb4259da716f17fccac0e84c632
font_02_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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