Malicious PDF — malware analysis report

Static analysis result for SHA-256 042dfd69fd7a3568…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 00:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32525a802c132debb1667f244f2ff2bc SHA-1: 26cb05fb50e448030f2117264c586bd7a0e981b9 SHA-256: 042dfd69fd7a3568ae91b1c3efecb34e4cb880151b13bfe6f6decff75c4d3506
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=happy+wheels+mobile+online PDF link annotation
    • http://studiolegaletrotta.eu/userfiles/files/13514152767.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/50347e5abe8e524741b84ce631d23d3f/92151669380.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/suvobenikivogokelomudalok.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2efqk02hprs8tqo43baikgrjfr/11977433005.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/36839461294.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/kariwevuguxululo.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/vomozipazaju.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/pezapimejugizapasez.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/82368569926.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/wodezi.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/27070373622.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/70647544810.pdfIn PDF document text
    • http://premo.at/userfiles/file/wevoxutagurelujipufa.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/zazozogowabaliwusuxidezi.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/jemominiruzidofupado.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/99936746618.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/62389796850.pdfIn PDF document text
    • http://wdnederland.nl/file/sedopexid.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/54920162905.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/78186868323.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/joxizubobura.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/58577816593.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/punalexovojiwimowareraro.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210903013810481.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/85735435024.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_off0000c2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DD 17348 bytes
SHA-256: fbe5acf1c6e8a559e77d51fb5938919b04ba2b7b8b56e4d453daac08c97f4d54
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10652 bytes
SHA-256: e4aa907c770521a78bc557ec7b4a7935e97a608a5595a550451df0612d408135
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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