Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a5a99dc99153a9…

MALICIOUS

PDF

73.8 KB Created: 2021-02-26 06:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ea572438aa8ce8dbb8afc4d3b8c6eee0 SHA-1: f67fe0a5fd143758693f7954e43f8c97c0868c30 SHA-256: a2a5a99dc99153a94a5ec915d545c44cdd5bb0864bd728961d39a7a554155f65
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to potentially malicious or disposable domains, identified by heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=marley+and+me+movie+critics In PDF document text
    • https://cdn.sqhk.co/devepogisog/ixieUpZ/fruit_smashers_food_truck.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/wexusewipibamaxiv.pdfIn PDF document text
    • https://cdn.sqhk.co/bijowiroma/hfPibpW/orange_tree_strain_wikileaf.pdfIn PDF document text
    • http://tehnotop.store/53720089478fesas.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/d6jfja1/galaxy_invaders_game_guardian.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/29108453113.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/guzululuru.pdfIn PDF document text
    • http://jobs-ingenieur.best/wesugemonamibujizhywq.pdfIn PDF document text
    • http://fbdirect.site/mibokasisuvelijn1mg1.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/sjaOmhd/kodojomaxodixesazi.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/ehgigjg/72034520137.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/ix0hehl/vampires_in_the_bronx_common_sense_media.pdfIn PDF document text
    • http://negozio50sconto.info/how_long_do_dyson_batteries_lastey906.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/iqgfDiZ/nodogixariwor.pdfIn PDF document text
    • http://zoompol.xyz/moxarudikorogijitadejijot6os9.pdfIn PDF document text
    • http://mastera-saydinga.ru/8241428905vh7gp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roteniju.rf.gd/9998314110.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_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 5252 bytes
SHA-256: 532d221bb6ec637d38eb18610f92c0533e0a64e0c6a9a7f94c2e4d25f7f7e630
font_01_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 10144 bytes
SHA-256: 4c34fa35a505d23edd5ceb02b3ce0e57f2b06d7b467f0e5c7cd169ad5bd40b8c

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