Malicious PDF — malware analysis report

Static analysis result for SHA-256 c263ff055a8f2a56…

MALICIOUS

PDF

81.9 KB Created: 2021-02-18 12:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c4cd8b897fe699291cef422181c6a8b5 SHA-1: f515824db6e8e7f589fe710b5ab72292a82f7e77 SHA-256: c263ff055a8f2a5682941c0098697b6144246fd98207f95ece38cb63561e839a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains or known redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites for further exploitation.

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://yafferge.ru/strik?utm_term=what+are+some+words+that+have+the+root+lyric+in+them In PDF document text
    • http://odebayitrafikhizmeti.com/kedomu72zs.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/J01jdvT/digital_light_meter_for_plants.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/hhja0Z7/escape_the_prison_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_602dfdf94b420.pdfIn PDF document text
    • http://choosemadam.site/kroger_weekly_ads_jackson_tnuspub.pdfIn PDF document text
    • http://zhigina.ru/20046274199h0fey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421473/normal_6002c374442ba.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/ehfRiiU/gulodiparuri.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/gcXIahi/pubixasonujofu.pdfIn PDF document text
    • http://gprofights.ru/7_days_to_die_map_generator0b9dl.pdfIn PDF document text
    • http://fruit-citrus.space/black_galaxy_iphone_wallpaper_hdtzr08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_5fd8ba2cabfea.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/TPjiWeL/skyscraper_movie_building_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tadiwolavis.epizy.com/2008_jeep_grand_cherokee_for_sale_ontario.pdfIn PDF document text
    • http://burafidofa.epizy.com/calentadores_solares_funcionamiento.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011201.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11201 23468 bytes
SHA-256: a22449fdfde4c228e6a5c9231ac8e49c2c9e7458e312e4a455c86b3e7ad43733
font_00_sfnt_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 5444 bytes
SHA-256: 8c6e63e3e4691f54cc1626cd82f21c2eaf6aad9b96f838ef6101d9ed6a930765
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 11420 bytes
SHA-256: ca36f1bae6898bbe19d01ef9a5b3a3b9dab6b796409077d4a8b1fe35e75b7375

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