Malicious PDF — malware analysis report

Static analysis result for SHA-256 4266afb3f7f5c2a8…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 06:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: e23902c55052cbb8ba679361bcfe08dd SHA-1: 37075970a9e726fd027e2ed53bd27ad4fd41594d SHA-256: 4266afb3f7f5c2a8ae84631289d6c9a111f99d1273108de9ad20e332db787c24
294 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=ver+el+amor+en+tiempos+de+colera+pelicula+completa In PDF document text
    • http://beririka.scienceontheweb.net/five_reasons_why_the_renaissance_originated_in_italy.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/c2QckbA/mens_hairstyles_long_on_top_curly.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/zyJJhgD/angry_birds_dream_blast_hack_mod_apk.pdfIn macro / runtime command snippet
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/2860e33a5e.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/1999682.pdfIn PDF document text
    • https://namadifudemabum.weebly.com/uploads/1/3/0/8/130813063/nubawesu.pdfIn PDF document text
    • https://gujuxufun.weebly.com/uploads/1/3/5/3/135398829/pikupumawipava.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/4328975.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/magedupavonoduduzifidazep.pdfIn PDF document text
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/691d0f3f4fe6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nefunupu/existential_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/87633278508.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/loneminovu/pudovekitok.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/xapidajovaji/40045992377.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/dawn_of_war_ultimate_apocalypse_tyranids_guide.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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 5184 bytes
SHA-256: 750fafaedbc1fbde4e5f52c312a97f55f0cd4166b42d91833d444d39bac51664
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 11400 bytes
SHA-256: dde35fb1b641ec704ea9e3879b1c7570ebcd10c4f2d00595edd88b462e8e2143