Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fdff9ba2608988…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 00:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d42bb3bcfd26622da83f97c8256eea95 SHA-1: a5011877643d80b255d7bc0b35c2190bc59277f6 SHA-256: b9fdff9ba260898895a5ae474e960a799ff814aee9d51487397e7cf0fa5054a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=my+city+mod+apk PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614282b764986---ladimuparufagimupuzibu.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/73726185114.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/muzexakazamesidusetez.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/vimegefora.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/85579378247.pdfIn PDF document text
    • http://01host.ru/userfiles/files/26394201530.pdfIn PDF document text
    • http://ty-int.com/files/files/6380884101.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/41331438484.pdfIn PDF document text
    • http://spbi.cz/res/file/derujobesage.pdfIn PDF document text
    • http://anm-av.de/uploads/files/78647985798.pdfIn PDF document text
    • http://freeski.hu/freeski/file/fexogixojoporaro.pdfIn PDF document text
    • http://redagowanieprac.net/Upload/file/90292951294.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/10619286736.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/mijorurudad.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/sajuzob.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/tamabibixezijor.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/19805363528.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/55145258523.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/80625099295.pdfIn PDF document text
    • http://cobmedia.hu/include/viraditaxekutat.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/82508267288.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109200731064414.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024209874f---99388484664.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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 10324 bytes
SHA-256: c5479ed2ffd4a2b1254cef0de3b94e97d1d6f28b9f21ff1a5afe586b273bd972
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 18124 bytes
SHA-256: 8295b0c59893fd8eebd5ab645ba6c4d89e18377b7d4f24ee704c678f331b92ce
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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