Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bdc0ca56845d79…

MALICIOUS

PDF

63.9 KB Created: 2020-11-11 14:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf17f7fb632aa6ce060ac8a932571659 SHA-1: d2c05f3b5e0548f8bcef65f2ee8defb050a623e4 SHA-256: 90bdc0ca56845d79d2f59a8e784b56e936d89bdd84d29a4b98da08dded63511f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URIs suggests an attempt to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=conan+exiles+skeleton+key+chest+locations PDF link annotation
    • https://vedokaxo.weebly.com/uploads/1/3/4/5/134529556/nonapuluposixoveg.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/11eccb2.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/defesug.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/3048033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f8ad536c1fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fa46ac7913fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivala/wewin.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/waterproof_cotton_cloth_ffxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42eaca8a-3c2f-4575-afce-7a2855ad5cec/33547264161.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/worx_wg309_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/msar_aamc_login.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/lugebutofav.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/r_and_r_sports_bar.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/boss_weakness_mega_man_x6.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 4928 bytes
SHA-256: 3d2663bc7d89b48d6577190f6e126b824440f8a38fe62a779980187f653e6879
font_01_sfnt_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 10296 bytes
SHA-256: 4ba944c21c31b758f2497ce9b02927db15b28e26fcc13d5482bfe3c2fec543dd

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