Malicious PDF — malware analysis report

Static analysis result for SHA-256 859995ee8591960a…

MALICIOUS

PDF

95.4 KB Created: 2021-09-18 18:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bc4a7015b28b23fc9e43ef980634fc4 SHA-1: 2327e6b495a58fe0c06e45c255acc128a922995d SHA-256: 859995ee8591960aa243aff360eaa3d5dee67a6b7c5c4e64181ce79de9268216
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=ruby+square+root PDF link annotation
    • http://esejsc.com/upload/files/jitamis.pdfIn PDF document text
    • http://njchemland.com/upload/files/58459276068.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/13713944047.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/satikefezizuzomuvasu.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/fegabakama.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d2c644892e93cc1205346a267dee7dcc/74862148527.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130db2cee3e8---gowujapajesekafekev.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/tekimejew.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/16835127061.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/vutapetuju.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/bisuxexabiwisareviba.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/kotukurofuruvebotu.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kekevofidusipesisolewu.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/piwigizuladuxubukenav.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/gomikofalafibak.pdfIn PDF document text
    • https://adium.ru/userfiles/file/7316199607.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1154414825613e44c58f19f.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/vugetusuredomusinapu.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/fogav.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109032155231767.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/83173600440.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/ronewadijezimuvalaxufimet.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_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 19064 bytes
SHA-256: dfee033cc04091aab48bff2692b7a444c2690ebd8c6f2ec7fddd601028782f98
font_01_sfnt_off00014059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14059 10404 bytes
SHA-256: d4cd93b25d86f4f2781d63f0a7506925f45ba19220374f01c08cb4a8d3e34849
font_02_sfnt_off0001581f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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