Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99c9d058083e793…

MALICIOUS

PDF

69.6 KB Created: 2021-01-28 21:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 159f44ff00691a428e59413d620c78ef SHA-1: 134ecda0282931eca7d6f001a5402b0ded1969c8 SHA-256: c99c9d058083e79371d85e0872f966f9a5e2b2fc53d2b818f5da2bfa83432d55
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=4%20pics%201%20word%20answers%206%20letters%20cat PDF link annotation
    • https://cdn.sqhk.co/jifigetuxu/jcii6hj/45446107061.pdfIn PDF document text
    • http://cashbackk.site/vexajejomisivuli3kow.pdfIn PDF document text
    • http://winoraama.fun/79889635872nm9t9.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/bb151ce.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/jf01jho/versatile_meaning_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/iaNmgiV/spanish_lullaby_for_baby_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/xusorawoka/hidghqc/business_management_issues_in_singapore.pdfIn PDF document text
    • http://6gusevshop.website/french_aircraft_carrier_world_war_25r648.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/fadedosi/sheet_street_store_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/abbott_and_costello_who_s_on_first.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/b_r_automation_studio_4_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/85498940384.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/15240009543.pdfIn PDF document text
    • http://punegejofuj.epizy.com/html_and_css-_based_design_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/80310723082.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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 5360 bytes
SHA-256: 79b0c37a83b60d0e3a2a81348050368fb53c7dce5b49414e8965429b9e360fd5
font_01_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 10204 bytes
SHA-256: 45b3a408cd93e7f216bf6936a7e88cdcdb60e11c6f0a6dfd36cbd946f6b66518