Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cf0c957111e836…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 04:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72979e1178768aeec411167b9474cc30 SHA-1: 7e04d2695756a8ddc907afe3efe725e7c913d432 SHA-256: e9cf0c957111e8366c195dfe0c0f3965cdebc2274ed1bd6640a74924eab10a47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of external URIs and the 'disposable_hosts' heuristic further support a malicious intent to redirect users to untrusted content.

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://ap-qatar.com/userfiles/files/53145567984.pdf In PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/28433703250.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/1019161393.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ranawelusizotasim.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/fofomupikexedotijido.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/60261471283.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/29608239610.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/82027502410.pdfIn PDF document text
    • http://oodow.cn/upload/file/210906185418735820o0g742pkje3y.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/35028669363.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/pirolojaresusitufoxibulu.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sokanilorevigusimag.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/44371196335.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/26742449293.pdfIn PDF document text
    • http://iknow.pl/files/file/lerujutejejuwatevufem.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/walawamelujetovepa.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/36240482494.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631145045.pdfIn PDF document text
    • https://promise-land.com/upload/file/futavigojawu.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/lubalaregiseju.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///ferevuzotabuzinakafutosev.pdfIn PDF document text
    • http://klenderbio.com/upload/files/88305468755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+print+4+pages+of+pdf+in+one+pagePDF 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_off0000bb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 15704 bytes
SHA-256: b1585edd9263420b53bf0a50d7610232b91e95a2877263e6adeef55454047dfd
font_01_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 10780 bytes
SHA-256: e108745feedf6b5745639133245e9f7a62680926e4a2f789443e31c3a426f4b4
font_02_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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