Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2520f78a765ea1…

MALICIOUS

PDF

86.0 KB Created: 2021-04-08 04:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1d7cd60507c7b697a6d6b696c08dd45c SHA-1: db6071f448fdf9ac76637d7fc256140468e1e81d SHA-256: 5c2520f78a765ea1648456fc3a692b00363e42946d3722b94f46fcfc2c34fb8d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 embedded URLs, many pointing to disposable domains, which are used in a link farm to obscure the true destination. The document body, though heavily obfuscated, suggests a lure related to downloading Windows 10, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=windows+10+italiano+64+bit+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459324/normal_5fe698cb72e47.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/2921580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456699/normal_6002af375dd95.pdfIn PDF document text
    • http://merogerofame.66ghz.com/43942893200.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/pexugesuko.pdfIn PDF document text
    • http://mmmuuuue.space/tera_new_dungeon_guide81r3j.pdfIn PDF document text
    • http://kvrovk.xyz/31766535373c4wiz.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/xabiz.pdfIn PDF document text
    • https://tubuzitobez.weebly.com/uploads/1/3/4/1/134108618/pedetap_luvojuv_zanagowejodog.pdfIn PDF document text
    • https://xogiwudib.weebly.com/uploads/1/3/4/7/134715522/tokutedogiri-fozanur-nozupowejod.pdfIn PDF document text
    • https://rexanofodifedow.weebly.com/uploads/1/3/1/3/131378899/0ff2a11ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_6036c38c25249.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/35214384189.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/auxiliaire_de_puriculture_fiche_mtier.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_60301fc830d17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410717/normal_5fdd665428889.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/rifemibiladeragonosexol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritarejameja.epizy.com/2266603703.pdfIn PDF document text
    • http://makuwuwamev.rf.gd/nattamai_movie_free_utorrent.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 5676 bytes
SHA-256: 4e45a48b4bc0e77775fed616ab90705499a3431f91ec1b467adf9da6cdd8b1aa
font_01_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 12020 bytes
SHA-256: 001e825a43871d0a1f01889c54910a36e2b35eec75058f2a45da025cd9e873b3

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