Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8e1590a0d17394…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 03:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a9b3138d38a785dd1586e64a1a86bc3 SHA-1: 17d9f246a5f040dd7879177f23e15c7a12c1f6d9 SHA-256: cb8e1590a0d1739460fac4a423c338f9fa50cc140778973eccf74c23db2d9c3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=why+does+my+phone+send+the+same+message+multiple+times PDF link annotation
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/18274121660.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/83066284502.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/72750145431.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/lepolobuxaluritasowos.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/wepefakitopuxak.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb85d30c6---16841705667.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/92661315364.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6f7153d1---11666627045.pdfIn PDF document text
    • http://elma1.ru/!upload/files/57404526747.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/45654462951.pdfIn PDF document text
    • http://vecsecity.info/editor_up/76557206106.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/38480154166.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/47600955619.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65098770235.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/3677368139.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/64905968230.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fixovojoboregekimenebili.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/fabovenulusadena.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29519017254.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/16735713348.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nasugapudinusovebodi.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/85501759129.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/pazizomafe.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_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 10948 bytes
SHA-256: 8d70439ceb8b0217d8dcc072209b68d480ea1b5e2d6ecd611c658e130132bda9
font_01_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 17256 bytes
SHA-256: 6167def42fbbc84ac702cf376c758bcd8d34b2f6127b42e095ee176e2188983e