Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b7c7280424e689…

MALICIOUS

PDF

93.4 KB Created: 2021-02-28 04:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 18e6695bb2eb1827c28a856c20851e6c SHA-1: b6ce0a23039359948a7aaad9d946782b489fb7e8 SHA-256: c1b7c7280424e68916df50ee88a63e673f3c7ee81441dbed8c62b94bd4efeb77
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that redirects to a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to search queries, suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://resalured.ru/wix?keyword=del+norte+jail+colorado PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388157/normal_60241e626d9ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448545/normal_5ff1118dc5782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_600a76b470f85.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/waste_king_legend_111_reset_button.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/93504306358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunonam.atwebpages.com/gezuporezal.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/what_does_cycled_mean_in_mtg.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/how_to_find_lattice_energy_of_a_ionic_compound.pdfIn PDF document text
    • http://wazinupizut.epizy.com/free_andy_os_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/which_bollywood_celebrity_died_recently.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/theres_a_map_on_my_lap.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_off00013314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13314 4832 bytes
SHA-256: 34738f7f3e511046bc07818d333647e279426e6a54243c5fcace817f63fe46ec
font_01_sfnt_off00014393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14393 10968 bytes
SHA-256: 8b3c74e841a26de1836f372cd6aae6ffc9d51e4bd3f1b1f6fff93fc138385eb5

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