Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfbc74ee54466d2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 22:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8afc05f3322e696c8a6be12adfd3339a SHA-1: bc6cc19f7bb43fc02d17ab6a3db3657afc175ff0 SHA-256: 5dfbc74ee54466d271d18c383186f99f600e1841232c4eb10748f221ffc4a9cb
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 URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=all+joker+lines+dark+knight In PDF document text
    • http://workmonster.net/morfologia_das_angiospermas0epi9.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/chehajg/49910764318.pdfIn PDF document text
    • http://hydra.moscow/best_meme_template_appob30b.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/juZ5hax/clash_of_clans_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/dasulujina/niecgdn/41923268661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fdf70c316ecc.pdfIn PDF document text
    • http://trylait.pro/silk_road_dbqkfhd7.pdfIn PDF document text
    • http://tixshopclub.space/dna_extraction_from_onion_lab_answerssdkby.pdfIn PDF document text
    • https://cdn.sqhk.co/zepaginu/IMFBhcP/65186698381.pdfIn PDF document text
    • http://tradestaroffice.com/fofuvok4z6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_5fd77c9941aba.pdfIn PDF document text
    • http://picsonair.com/1872871751zwkiv.pdfIn PDF document text
    • http://taher-tcac.com/616296130070f5mh.pdfIn PDF document text
    • https://cdn.sqhk.co/gefeloxo/iahajcl/open_source_image_editor_macos.pdfIn PDF document text
    • http://hookup154.space/amor_eterno_sheet_musicf04f2.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/f5afha2/samsung_ssd_configurator.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/huvWVhj/remibaragufisud.pdfIn PDF document text
    • http://parralax.net/bizajosuvorubojuniba9mjgo.pdfIn PDF document text
    • http://eliyalte.com/wozovujesofurugefk5p6u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_60333f09de0a7.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/rutupozomipupipiwazowoje9zn0g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 5216 bytes
SHA-256: 999ee237e5c3d9072931a8aaa2e3bee2ec0afd1f52b139345cb358567ac96453
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 10432 bytes
SHA-256: 34ac248dc8e67d6a864950ddee64be1b03ccb8c132d6823ea03027dbb2d85864

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