Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b345cbcc79e561…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 19:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6b5b7f1e9352ef0910d60f439ad4b264 SHA-1: 70a252e1e58b099ee22bf2ebf400459e03c940c8 SHA-256: 39b345cbcc79e5610c3c548f80594d31f5fde8f28cc28329de72a82a5ffc4d71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous external URIs, many pointing to disposable domains and structured as a link farm, suggests a phishing or malware distribution attempt. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights the suspicious nature of these links, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=android+mobile+in+pc PDF link annotation
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/ketibedup.pdfIn PDF document text
    • http://axwelindia.com/uploads/wumejokiletalex.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/zenavetuniparupite.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/13795536663.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/10356076294.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/83590391527.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/59222884499.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210915_225124.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/kegelebipo.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/foralobirivos.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d43713836---zokololodu.pdfIn PDF document text
    • http://jsdarvin.com/files/91872169596.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/61155696365.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/97041050321.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109052237294425.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/65590107774.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/nutezubudazom.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/dewevolasevewuzaja.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/tirubezivuti.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/volonudil.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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10368 bytes
SHA-256: d032c1b1caf887133ed32e963ebf1afc73838105c1bc425db3c1d2766538c0a4
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 17904 bytes
SHA-256: 64f6da265decdcdda4f29cc2b288c90cb4bc418dea3f64007e4948dcbefc455e
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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