Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9f6b64cf7128c1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 18:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75e32ccc1aad8bba85e5d2879dc9e30c SHA-1: 756bbf7524ef2f87c0166ab4c1b31fbc87f2d108 SHA-256: fc9f6b64cf7128c12455689964b3aa3ecb128d581837bdf4b6b3b8d530674200
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious verdict, suggesting the document is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=any+video+converter+for+android+apk+free+download PDF link annotation
    • http://yaan121.com/uploads/files/202109021131252120.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210914020508.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/felipejemunutipotow.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/12930187001.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/98059209472.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a3df66d28---90304105032.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/31067687238.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/17724845169.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mejomidedukevej.pdfIn PDF document text
    • https://basisnomor.com/contents/files/kagodu.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/39268859456.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/suloladubevekazinuxun.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/63459324116.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zomagiremipudi.pdfIn PDF document text
    • http://dges.in/userfiles/file/mazawewaxunupitonafa.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/47340883494.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/felezava.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/gubokexoloxusimitufuma.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac36c9b670---gizifisa.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/pepisukasalidaburexa.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/68085316730.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/dokovew.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/takib.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/gurogesarub.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/48587680954.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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 17456 bytes
SHA-256: 851254e84fb60ce6b2c790ec4334bc4c8cf4e3540426f9bbc6d720f6528b029f
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 10784 bytes
SHA-256: 0a3f36fec3fb3423cae3a5c2dd012390e612eba9ec6ecd7712db300a52c368ab
font_02_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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