Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98ba5479a106b11…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 04:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 986b7b5a957f23f32327dcbf625baef6 SHA-1: 4fd75def170b27a3cfce8223d75dd794ebe86016 SHA-256: d98ba5479a106b11666b80b14edd44adfd6138112c5fe19cb39e9e694bf28bc9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of multiple disposable link farm domains and a raw IP address in URIs suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=mini+militia+mod+money PDF link annotation
    • http://chonburi33.com/userfiles/file/gukigowos.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109201935218498.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/tobiw.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/dudagapasozenexajekimukom.pdfIn PDF document text
    • https://isleo.com/i_photos/file/502287740.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/51584544279.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/vaxezelebi.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/56239407329.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/48963358882.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/vixumujegogadi.pdfIn PDF document text
    • https://ijpdua.com/contents/files/13903421613.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9e69125e---jopudufixurub.pdfPDF link annotation
    • https://pilot-nav.com/ckfinder/userfiles/files/xunofuxozujumefivobetono.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/14898067929.pdfIn PDF document text
    • http://snft.ro/media/file/53376608201.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/13539743876.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613250be5ea35---lolip.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/36992054951.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/36928197569.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/54710936296.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/75293893581.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/merofepakakenelobezalano.pdfIn PDF document text
    • http://ranch.pl/files/file/zonok.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_off0000c917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 17732 bytes
SHA-256: 5224a0d685a54e1d8c77655b360c481409be5f18937aed000ac6667fa984eb9e
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 10248 bytes
SHA-256: 53a63915bf9e1eecf88181d665a46345568e2e1f34031657802bc77dc78ab014