Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07296f7d1fb4bf5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 20:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b190eea0fcdd36b45d544926441f6c25 SHA-1: f959a6124bb2bd3d81921c328fbf2aaa8500a426 SHA-256: a07296f7d1fb4bf5ddea9ea672e0648b11540348b9b26e5ce67f2d2f786015b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish users. No scripts were extracted, but the structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/75661263255.pdf In PDF document text
    • https://astdubai.co/userfiles/files/76140573062.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c4d46594---94609347511.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/gipanuferek.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/30513808230.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zowazor.pdfIn PDF document text
    • http://irollee.com/userfiles/file/88679280703.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/gavelabiw.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a95c9e5807df39b2872fccee4424736d/lojofamorex.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/64081951535.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210905194920.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/42879546901.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210909060415.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/48177273392.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/53263552886.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/wusixulunatub.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/10536618055.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/patesigebufidagasafisato.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/gaduwemobumubatodowa.pdfIn PDF document text
    • http://profstil.az/userfiles/file/devolopodonakukagiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=namaz+vakitleri+androidPDF 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_off0000c757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 10436 bytes
SHA-256: 325f97388b9cbeb999a27a0edadeb3ed6c9ce56f9a5ec751f1e74eecc3b4db05
font_02_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 18564 bytes
SHA-256: 515f6bd46cc6275cee4a9fd510d3cae0a934d0adacdb512f61c09d70f93dc522

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