Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a43e3e39d08e89…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 12:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb7dd281a3ea281113afb27bb3750158 SHA-1: 6e5e3c11525db085c3ad63f15af993514007774e SHA-256: 77a43e3e39d08e8932db9f156a969c1f8c67a179a2aaa44215f6143febc9b9f9
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 presence of numerous external URIs, many pointing to disposable hosting and acting as a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, but the overall structure and URL analysis point towards a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=how+to+watch+yellowstone+season+3+free PDF link annotation
    • http://stagelight.pl/userfiles/files/lejifirobalavawason.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/27920688972.pdfIn PDF document text
    • http://sin-hua.org/userfiles/60050511161.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/34637264688.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/86800414912.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/60626248600.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/vimunex.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/galevafebewar.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/vegomak.pdfIn PDF document text
    • https://egf.tw/test2/images/file/47885652546.pdfIn PDF document text
    • https://ikansambel.com/contents/files/33718623068.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jewezimenow.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vupalekajug.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/kojotexub.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/tiden.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/totojobasoroneli.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/72359192505.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/favejajanitu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/84001468108.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/buvijifalunaxagipirawejo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134025c8b04a---26331223082.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/70407334913.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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 10704 bytes
SHA-256: d5ae3f778a0431b726334656d7010dfaf6e3802ee6335064c9ed66d3f81da9be
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 18648 bytes
SHA-256: 48036df94054cb1547d316a1fa2ca7f527c9f5a87003ef58c274265a0b80c2a8
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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