Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd55e503160cc4a5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 11:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6ef62d69705f1532151eb724d757bb8 SHA-1: fb6d52339abcb47a0b16549b2c5070e4a73a6d0c SHA-256: dd55e503160cc4a5155b087cf70df62f427dc82dd270eac325517ba532db1c25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware or engaging in phishing. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=ml+32+bit+apk+2021 PDF link annotation
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5216a0ed1---lirudikegefi.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/11681539964.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/dukunofomiwo.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/17980267356.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/rilizanibeforesebaxa.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/sebipemoworewugenugapi.pdfIn PDF document text
    • http://askort.pl/Upload/file/59127777568.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/21147186973.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/tolemizalagasadula.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/ginesudepodorox.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/37125882567.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/gudenajisokejejavusisev.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/95573047356.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/52469986589.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/60559227833.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m6okf488vaqja9l37iardgnp96/titegipugikupofaniviti.pdfIn PDF document text
    • http://a-pluset.com/userfiles/jominukewowagu.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/58548122035.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/67373849054.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/zegovufowojakozupejete.pdfIn PDF document text
    • http://novafish.it/userfiles/files/tifireforonezodonuzazinin.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/43173327518.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/momumusoduti.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_off0000b0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C6 15316 bytes
SHA-256: 30b7d1e4792661ee27bb7c38f1d23fcbc22e77f0dbd78ace3794bcf4137e8681
font_02_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10312 bytes
SHA-256: fdd6f161563cc96301ab879537324f62d27a4ab1a35dcd4796c5ce439aeeb695

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