Malicious PDF — malware analysis report

Static analysis result for SHA-256 640905c36d882be0…

MALICIOUS

PDF

88.5 KB Created: 2021-09-09 17:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1608d934d45e36a847c7617865a266f7 SHA-1: c4da15e7466cfe260566e2e9f399b017c518a2d7 SHA-256: 640905c36d882be0f01ac712e48568cca8e1bbaae2c434672b88b2e77468dd10
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were extracted, the presence of multiple unknown URLs points towards a potential download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sieuviet.net/webroot/img/files/luwik.pdf In PDF document text
    • http://kadh.kr/bobod/upload/file/pabagolugukulijefexemuxa.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210904022217.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/50155022908.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/59171669297.pdfIn PDF document text
    • http://perksys.com/userfiles/file/23158087603.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/gebisirudogozubeto.pdfIn PDF document text
    • http://etnorom.hu/pictures/26824771594.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/53552302552.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xowetamovuzejusokobikam.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/81761649631.pdfIn PDF document text
    • http://donghotam.com/luutru/files/239139329.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/jafitadetitame.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/62330886363.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210901103231.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nirus7hic08h7vnl8hrovhqcog/womevosogoweju.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/19582085812.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613091d4ce5e7---vuxojiroras.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/wobik.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090615143488.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/50713107635.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/fodipow.pdfIn PDF document text
    • http://air-con.ru/upload/files/jovogu.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163051538342d0f7ee600116ffc6b2.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/gepufubewidam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=one+room+kitchen+full+movie+watch+onlinePDF link annotation
    • 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_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 10800 bytes
SHA-256: ae16b541e7ec0fe04a1577574f46c40ac15f0459134e14d18f6b4b3cd4645e10
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 17788 bytes
SHA-256: 005bfe83f5a0a65041850c2f8967f1cd35f8b9cfb98329c1671fe560a08f919a
font_02_sfnt_off00013c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.