Malicious PDF — malware analysis report

Static analysis result for SHA-256 c141765b82df9314…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 18:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2366efac7f63b29243990f5120a6f7fd SHA-1: 3528fa9d3e52293710b701e26cac043912f4128b SHA-256: c141765b82df9314c403bc05a0342d9901a87d5cb9ed0e3aa1d0b1bdcd78707b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users to malicious sites.

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://catamma.ru/uplcv?utm_term=best+mobile+android+games PDF link annotation
    • http://captainkillmite.com/uploads/files/202109100533302878.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/69051536847.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/govafasomasopek.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/93309522094.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/wuxelada.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/38898085985.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/wezavadipevulozok.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/pidixabuwuxezitum.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/lajebozo.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/garabuxuwubuvugel.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/36920532342.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/14371099659.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/meporemukalibudewabe.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/fowekinoluwagexez.pdfIn PDF document text
    • http://mobilenmr.com/files/files/nobejurixemubugajawo.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/danuriwefubedenumimixake.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b6ee03c2---75364697962.pdfIn PDF document text
    • https://preciseenergygroup.com/media/87229920395.pdfIn PDF document text
    • https://olterus.org/contents/files/26629332072.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/guger.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210905002831389297965lifw1p9go.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/buzesonujefikegudapufol.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_off0000d3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 18392 bytes
SHA-256: 95eca11dbce95d53ad6976e3a695e40b29186d1c5651022b25afee98073432c8
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 10784 bytes
SHA-256: 92ed4a221e100f3a83fe5fb075f89851eeb8ed609c6167fdc72520b0a538ad79
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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