Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83050b79bacc66e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 08:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a86b3c38b6c8006923bfaba092766bea SHA-1: 36b62d5df1204ea8136d537f45f5e932898b8098 SHA-256: c83050b79bacc66edab926a34291169be863d25479e1e40fd8ad7c147f78e1f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, with many distinct hosts and UTM term redirectors, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://msnladyboy.com/ckfinder/userfiles/files/vogetefedisodivomeduvuke.pdf In PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/lejizesilukegesizisiv.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/24079782061.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/69816866974.pdfIn PDF document text
    • https://kratky.eu/files/file/24252122487.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05dc3515a---naxiwi.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/tanobesigifi.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/80623343799.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/59584818885.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a3e303aeb827f77e43cd04d27ed43804/66254819199.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/82461955787.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/35802110479.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/godirazi.pdfIn PDF document text
    • https://rotitelor.com/contents/files/keturutexofejevol.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091413471174.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/24841274114.pdfIn PDF document text
    • http://whatdwellswithin.com/file/59522022130.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lonisodagibemewa.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/50441586669.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/60996059852.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/87276342592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+camera+phone+under+10000+in+bangladeshPDF 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_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 18620 bytes
SHA-256: 6abf7039f4645659b365cdee6c4f8092f97d3bcc8f73d9088d2bd1afb383e8e4
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 11428 bytes
SHA-256: 514f985da62d975d13bd2569bc82e16dbd985b12062543dad89471593ae4feae
font_02_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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