Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb43d77463096048…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 19:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff18f95669218ec50031be662a25ec76 SHA-1: debd92704d992519f82d2dd6b869a2d3fe57a695 SHA-256: eb43d774630960486a3dcb75b35d6b7437378531a2e4e814a29766dbb48dec64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://camphacement.vn/upload/files/87170853259.pdf In PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/lunokilinopevokepurewufed.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/141f21660334e85e59b61c180f141ea6/3958018975.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///17976157375.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/52581925765.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210903101805.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/dotuf.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/sidomimosenifuvazozu.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/fagoken.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/dugopapujozox.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/37185996025.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/safebomiritoxemidi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/2285012274.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/gikozufobidetoxeno.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jobesalogekizo.pdfIn PDF document text
    • https://ayurmitra.com/files/file/1649008926.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210907_182608.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/22918794150.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/sasulanisolile.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/sowimegefurowosunetarolo.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/64963679795.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/63549147100.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c95e15e9---dubezofinojexajerulo.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/bexorevafubakazarajiga.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/kozizi.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/sajodavilok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cbse+class+11th+biology+book+pdfPDF 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_off0000b697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 16540 bytes
SHA-256: b9a1160539f8485a6ca6073acb4c7704b1930bbabeec4d9a1b01f3cd2fa4c14a
font_02_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 11124 bytes
SHA-256: b36ad9fdffc7d3de9abd59ca06d373c26a16d51e638a8617cb85a2f8f550d79f