Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d35328be048c56…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 17:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0db6712ff8ad6fe7109d07c0c683bd5 SHA-1: d327271ace8422e8124e4ecfc3fba831db549f4e SHA-256: 24d35328be048c56605c564f8b8eb9e779a51980b2257a3cff496d0f1e77b924
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV and an ML classifier identified it as malicious, specifically a phishing trojan. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/51781491071.pdf In PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/depunexefifatomegavej.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/toxatezoxidoxofonaxusari.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/redesusi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384add93c1f---limegasi.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/wutofawalebutogusome.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/devire.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/17661624888.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea841a827---nuzefomusofur.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/sokowalaminuxebaxaj.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/18046427432.pdfIn PDF document text
    • http://metall-press.ru/files/6105707622.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/sumelozitufekutugigutu.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/74323983775.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/42141123279.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/36262584006.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/jasetotisutiladefajula.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/wubebumodizogexizevi.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/7238895662.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/pulefenorosobirojo.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/nugezufufiv.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/89198699258.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/54126688875.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/tovirafevexajowanuponeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=amazon+prime+for+android+tv+apkPDF 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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 10644 bytes
SHA-256: 20543af5325acfa6aec830ca7dfe03e6985490fda9fe86b9937a021f01bffa37
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 17060 bytes
SHA-256: 35111c5057dd93a759ecca1506b15b2d579ac75c1bfe1ee204b6901ac3b32fe5
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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