Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cb69d46377b3d4…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 13:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c8700afd6fa712e3417f4523bb91eb1 SHA-1: de35104c5f444dbc798b45fa1048528924f962b1 SHA-256: 76cb69d46377b3d451a49401bb971eb4846ebebeb48889d5ce307d2600bd98b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links, many pointing to potentially malicious or unknown domains, suggesting a phishing or malware distribution scheme. The presence of a link farm heuristic further supports this, indicating an attempt to obscure the true destination or spread malicious content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://britishcytology.org.uk/ckfinder/userfiles/files/pafasax.pdf In PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/61090544556.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/82105471647.pdfIn PDF document text
    • http://manu-transport.com/documents/file/mejakitozipubalodod.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/28737259518.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/51309877359.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/23c289253aa3beaf39463f2717230259/tugoso.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/12128124173.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/bezekamox.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c649fdf5fcfb9661d0a64aac91dae082/76474623101.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/rorev.pdfIn PDF document text
    • http://getvisa.ru/images/File/57900010187.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/geledekijuwaz.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/76536472810.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/48234666055.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/96073278812.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/65284481309.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/jubonupukufopeji.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/42870092605.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/75278166366.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zufivetewosadezezixori.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/fodokexibowobofesoxonile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sky+movies+2018+downloadPDF 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_off0000b1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FE 11148 bytes
SHA-256: bcf3ddd18e5ca84254b55256eb3b00985faaa705ff0c35759af6562ad715d623
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 16092 bytes
SHA-256: c71ac9625db3442ebd79abc6e4dab2dceff8dea3b8940473aa1d200068dd4db1
font_02_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1