Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3476d6b0eb74a1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 13:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1cc2e9413008a69eb304a789973d897d SHA-1: e900f26a3814ecff6280d92d8066eabc18a12b9c SHA-256: 9d3476d6b0eb74a13abc8823f071ac5e226dd16a895c9bb104ac3178bea86722
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a PDF vulnerability to execute code. The presence of numerous external URIs, many on disposable hosting and using UTM parameters, strongly suggests a phishing or link-farming campaign. No scripts were extracted, but the PDF structure and heuristics point towards exploitation for client execution, likely leading to a phishing site.

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://irlanc.ru/uplcv?utm_term=best+gameboy+emulator+android PDF link annotation
    • https://intrastorg.com/userfiles/file/23826777088.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/63894819107.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144b855c9953---rejafe.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/9597067721.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d86304617f---wovunob.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/jifetu.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/64697964769.pdfIn PDF document text
    • https://fototipia.hu/files/files/rexat.pdfIn PDF document text
    • https://togeltop.com/contents/files/21671618252.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/besis.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/9316764950.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/13915056857.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///romabavawijubejesawa.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/basafilizusenigi.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/gememixozadugugirofidiwuk.pdfIn PDF document text
    • https://strechybenesov.cz/content/jerewizi.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/nirex.pdfIn PDF document text
    • http://insei.eu/userfiles/files/91899272497.pdfIn PDF document text
    • http://modern-pro.ru/files/file/12954785645.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/88530891212.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/zobanogosum.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/92026074390.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/fujuvu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/kekisizugakekorexiwasal.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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 11000 bytes
SHA-256: 248bb10a83441b9dd22e31a6c7673c60297429c0f18a59ae9f7de833e7bcf9d3
font_01_sfnt_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 16740 bytes
SHA-256: c0b7c1cd25e62b368d6bdb32048c28478cc18aec13189177bc117d9ebfaf5352
font_02_sfnt_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1