Malicious PDF — malware analysis report

Static analysis result for SHA-256 3411235254101832…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 06:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 931fbd54a50cb631302fadb12e686f80 SHA-1: 8af3ce34df5cef66628ccdee2f9f2d98f8fc6272 SHA-256: 34112352541018322bb79dbfa4f881f84f7cbfdbd31079fad7c0f779a3b6eb9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=mod+3d+sniper PDF link annotation
    • http://giteduguedesboires.com/userfiles/file/45758467120.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/36292945284.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/saturuni.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/xavenupalize.pdfIn PDF document text
    • http://cssh.es/img/file/getanoxijufejo.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/tidubir.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s23rt34e2b371879fl3114j8t1/zulosanupimanaladokovanib.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/92921891955.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/22270308178.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/48967982256.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/tumotesapekezazaxixozebo.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/zukidavadep.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/lewonasekiwutivagi.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210903120443.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/39846709931.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/46456836332.pdfIn PDF document text
    • https://fong-cai.com/upload/files/fezikuginotimubodizatal.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/21183749206.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/96660634583.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/79185818096.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/542480599.pdfIn PDF document text
    • https://olterus.org/contents/files/jesig.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/tutipafu.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/faligenimoxuwesana.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/30991203071.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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 10244 bytes
SHA-256: 6dfe043c6c2cb9861f8a37b0c9ffe3efe8e046b9ebacd7b4e1343cf6fa675afa
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 22404 bytes
SHA-256: c34cc893018b32047a1e90115d86d2880468103110dc6f253bcb138eb63696d3
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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