Malicious PDF — malware analysis report

Static analysis result for SHA-256 9296767e0553736e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 19:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff3d2bbd480ebbf996aee3508f8f0a29 SHA-1: caa0be90374f05927e04a767470a2342e6d2f2a9 SHA-256: 9296767e0553736e6126aa869801348969a8243bff050c1aeec3efafbe4b0f54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://elrey-uslugi.ru/media/file/69405289754.pdf In PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-4/20210904113254965886.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/50289301722.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/60254040428.pdfIn PDF document text
    • http://metapolar.hu/tmp/65983705459.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/lojuwolasovajijolugun.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccc715f6a---85576026469.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/2883743419.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/34275132932.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/toged.pdfIn PDF document text
    • http://nicklason.se/ckfinder/userfiles/files/90334037259.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/garinunilotaj.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/wipozifopitanazusugiwow.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/18918352318.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109110425582814.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/55710590295.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/39268859456.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/tetisofadoka.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zelevipopuraxuduzelobube.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/nurexipopakepigikanemutug.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/pipuwobose.pdfIn PDF document text
    • https://limsurdua.com/contents/files/14845470366.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sibegewozakufa.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/tigatujutagidoxodeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+gba+new+games+downloadPDF 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 18172 bytes
SHA-256: 5e49d3f63cb516a5143bd694760eb06c403397e59b4af20f4152ce02ca4cf99b
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 10620 bytes
SHA-256: 45277dfe292bd70b21d75579985ecf8622b662d5d30e2e94a4366382bbae50d0

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