Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99bdedb108d26bf…

MALICIOUS

PDF

94.8 KB Created: 2021-09-11 23:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a617818c7bcb75a79285e8072a9c0583 SHA-1: 751ad09e66a13dd5f49fa0ac1c8cae1fe48b0c4d SHA-256: e99bdedb108d26bff2bd47c28d620564a71f7fd5f39795ddc394c44c0a38fac6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document for using disposable hosting and UTM term redirectors, reinforcing the phishing/malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://webinaris.net/ckfinder/userfiles/publics/files/38299086605.pdf In PDF document text
    • http://abnicum.ru/files/file/93355076943.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/wafasamukojeposurozofimo.pdfIn PDF document text
    • https://znalac.com/userfiles/file/walipasefen.pdfIn PDF document text
    • http://shamayachts.com/upload/file/41138670203.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/degijoxutulerabuki.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/gimakiwi.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/41427218628.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/95774611364.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/jovuzeben.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/58342164618.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/24365544453.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/70543294196.pdfIn PDF document text
    • http://letdentalab.com/img/files/49812135047.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/93630640449.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/doxidonemibupuluwite.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/varojopimoj.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/ruxobev.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210904221304546.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/dejelajulifovuweluwor.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/davaxipajodolozagisoz.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/851e28e9aa463c920f7546abef5d7ca8/wexogurumijibe.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/vofokamixo.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/6680424000.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/23378292949.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/20967216150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=super+bass+roblox+idPDF 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_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 20872 bytes
SHA-256: 40a9a32268204c9eba0ef7e7cec68718b753f0ac6d6052a6f6e1273798d8e793
font_01_sfnt_off00013cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15514 10600 bytes
SHA-256: 1466c86bafc7135bbed4574def13a437a0b978081581501b166436fdd525fd71