Malicious PDF — malware analysis report

Static analysis result for SHA-256 debb4663f9aa7b67…

MALICIOUS

PDF

73.8 KB Created: 2021-04-08 08:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6046cf4e5434b282a49ef6c77fb3cf14 SHA-1: 857c4b7dc4f71da2afc8edfea6aa8e588ce97c77 SHA-256: debb4663f9aa7b67317c534e60cd9be96cc0445fba6fd4e5e53d80f70634b4d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

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://jumiwimov.ru/123?utm_term=infinitesimal+canonical+transformation+pdf PDF link annotation
    • http://birulozezogi.iblogger.org/alloying_process.pdfIn PDF document text
    • https://cdn.sqhk.co/banibudofe/BdcigrQ/linked_list_java_tutorial.pdfIn PDF document text
    • http://gebuzof.22web.org/sorizarukaliniponi.pdfIn PDF document text
    • https://cdn.sqhk.co/jikogifuxa/iBKhdib/rukukidakegenajewixa.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/16159690247.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/Sftm4ib/67390392648.pdfIn PDF document text
    • http://warokibujiz.getenjoyment.net/bagasse_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_6064997ca19c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_606be7f7ce086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_605261f779f24.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/JHjhlji/95989765982.pdfIn PDF document text
    • https://cdn.sqhk.co/nibugikik/Gjaig3X/bible_games_word_search.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/7LgjBgc/10948734411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorokam.rf.gd/95767946284.pdfIn PDF document text
    • http://sekijipaladi.epizy.com/50484343349.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/kobokejarugurejo.pdfIn PDF document text
    • http://gusufarafedi.epizy.com/the_avengers_game_apkpure.pdfIn PDF document text
    • http://gagisejokunego.rf.gd/24706416675.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/datepofadafokejugapuvu.pdfIn PDF document text
    • http://pedoboxituroz.epizy.com/kizinu.pdfIn PDF document text
    • http://miviguwi.epizy.com/despacito_lyrics_download.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_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 5236 bytes
SHA-256: 8bc0b454e6dfaee9549465d2e6f384c0efc4f97d666cbdc9db7c09b966afb5a9
font_01_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 10736 bytes
SHA-256: 644c3f01165decce3d424035f801f3a2869f32529256516b1ef6fbaa77d149df

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