Malicious PDF — malware analysis report

Static analysis result for SHA-256 5674851f411bef3e…

MALICIOUS

PDF

66.4 KB Created: 2021-02-05 04:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: ad1503bb478df4d105f9203270aeefd2 SHA-1: ef7b28d0c3bb1601da89702e0db09c0d0766ef0a SHA-256: 5674851f411bef3e76d19a983ab42323396af09939551473b56b21f8ecebb83c
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/wb?keyword=love%20couple%20images PDF link annotation
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/ae888c0178.pdfIn PDF document text
    • http://chunyoo.com/free_baseball_scorebookvkku8.pdfIn PDF document text
    • https://mipoxijal.weebly.com/uploads/1/3/4/7/134709746/nepimozekiwik-vogofupenavu.pdfIn PDF document text
    • http://genusttwsr.fun/micromachined_transducers_sourcebook5t0qu.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/vetuvuwafiteruro.pdfIn PDF document text
    • https://dinofewujib.weebly.com/uploads/1/3/1/3/131379591/f60aa7d375a.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/IkchhSK/18012114507.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/vatakefojunib/barthel_index_modified.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/pijizisimavizi.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/afmc_medical_college_application_form_2019.pdfIn PDF document text
    • http://tinozireru.epizy.com/avast_internet_security_2017_free.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/cisco_881_router_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/68418163291.pdfIn PDF document text
    • http://mujedofagogi.epizy.com/acronis_true_image_8._0_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/appsense_application_personalization_templates.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_off0000c77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 5160 bytes
SHA-256: b1f2fe24b8c61fc6113a6c6f06a4db74cd538e64d50e68d90eefaae0f8d6a15c
font_01_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 10876 bytes
SHA-256: 122e2717a4316f90fa1f579cf12c65c724b714d6a87d3169545c9b04b8c36afb