Malicious PDF — malware analysis report

Static analysis result for SHA-256 779fe35a5a17683c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 07:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ee6c686f4dc9c0998ee7d0673dc79ad SHA-1: 1e62559bb43a3141d1227a2c23bdff14d841fffd SHA-256: 779fe35a5a17683c36d12ea4c9f8dd9c2111a15b82689d5dc1f7ac1efc28d6e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, with one specifically identified as a redirector with UTM parameters, suggesting a phishing or malware distribution campaign. The PDF structure itself is identified as a link farm, further supporting the attack pattern of luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://chcial.ru/uplcv?utm_term=my+anime+girlfriend+mod+apk PDF link annotation
    • https://centrumschoolka.pl/photos/file/rivuxugusajimugamovenuri.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/44734061217.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea0f4f599---jilomexudotitezefuvuvoged.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/11219394544.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/727brbjn9usl6q891bm7hembc0/62460723683.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/66676144406.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/kotabowake.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/5644975544.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/32648731268.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/lemipakawot.pdfIn PDF document text
    • https://rosycaffe.com/file/11892122712.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/muginaretuve.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/dabopafefu.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/66304770457.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/jematakanifipi.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/lanusenuratolopidufaki.pdfIn PDF document text
    • https://ibextrail.com/editor-images/32746683455.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/bovinidizaverab.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/mefifotamotiwofaxewezu.pdfIn PDF document text
    • https://nada70.org/userfiles/file/jufit.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/63958025440.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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 19580 bytes
SHA-256: 965c99b8611e8bfa4641023fd2d755ae25149588d76cf6517e6fea98769af4e5
font_02_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 10772 bytes
SHA-256: b8eff73617d6fef2604f7f00df75c327b686236e09b8cfc6d1e748f14bb674fc

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