Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1ae00644743506…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 00:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45912c0e2d7104c31e92cc6fc0a2940d SHA-1: c270f675df962ed47eec61eb1dfaac21830a840f SHA-256: 8b1ae006447435069a6b8b03b9c49d078677814962b4d55efe0288e8ef64aa2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=paranoid+schizophrenia+symptoms+list PDF link annotation
    • https://kakakmanis.com/contents/files/detitalinojuwixiralomuzax.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/lesulixosun.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/fetumemew.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/49731030911.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109081702468273.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/juboxusimudiwuso.pdfIn PDF document text
    • https://bdata.vn/upload/files/fogatepoli.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/sawosebatus.pdfIn PDF document text
    • http://balalajka.nu/media/13100311576.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/44390265374.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/mavogom.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134e23aae47c---902673037.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/27792315491.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9872a0c0---muzezejijepifovotuvin.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210906_CEEB3A8A7AE3E134.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/38591263719.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/xejafebazazotur.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wizavijaziluzupo.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/10820757205.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/99863884445.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/tuvezub.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/28403573742.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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 17392 bytes
SHA-256: 17f67fd9eeaaaf343aa67034e1c0ce8126ac316aa50ba94622f13939cc9c1e9b
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 10952 bytes
SHA-256: 9b2591d0261a1d7a293b6f09a27b2c373febcf6b89a3505000de90a4aeef08ad

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