Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99b2d78ab643763…

MALICIOUS

PDF

73.4 KB Created: 2021-09-28 07:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c26592a6ab75023a6ccb03450bf623b8 SHA-1: cfc492e196490ef37b2aba24811f4733861dca4a SHA-256: f99b2d78ab643763ccf2a103a7f2644e75993b938e0863491edc40396348a6c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://supair-lux.hu/ckfinder/userfiles/files/10040596311.pdf In PDF document text
    • https://at1apigroup3.com/contents/files/20033850794.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/savuruxunapub.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/lepupafodupulavefebegel.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/71841892229.pdfIn PDF document text
    • http://oiacreation.be/userfiles/file/8704776638.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/74774495923.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/31506770993.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/juwuw.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/pozijisapegetoxetiwuvi.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/98212486735.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/36851621682.pdfIn PDF document text
    • http://kaies.cn/upfiles/21092810321420275216tp3g.pdfIn PDF document text
    • http://mamam.by/upload/File/file/kedotefor.pdfIn PDF document text
    • https://aspirans.com/files/file/bifeninisax.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16146e59a5f588---72712546611.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/nefilid.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/rojuwuwima.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75558211514.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/furekafumimotan.pdfIn PDF document text
    • http://ponozky.gultio.cz/webpagebuilder/ckfinder/userfiles/files/papepidanufunodesoxexo.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/67105155963.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109150733363437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+mengekstrak+file+zip+di+androidPDF 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_off0000b6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DE 18156 bytes
SHA-256: d33e9cb7d64156b942a4a465381195741bcbd6cddb5b94b399c62b408dcfb141
font_01_sfnt_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 11024 bytes
SHA-256: 80397003fcb5f5aa29887c2b6d8348db54a6a908a3ce121d1a07684639b8f702
font_02_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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