Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac94fb518d9587…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 15:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1c7f6d2629e24f91cacaaf03ca07ba19 SHA-1: 1ae1bba1c10473073f450ad27954c546dab8d22a SHA-256: b4ac94fb518d95879f2cc72a8dc999783eac0398fd64d75d801cd3724549ddc1
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=john%20deere%20lawn%20tractors%20canada%20sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404753/normal_5fce47df9e254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5fdd898d94e2b.pdfIn PDF document text
    • https://fijogukovope.weebly.com/uploads/1/3/1/3/131379832/8701357.pdfIn PDF document text
    • http://didazema.mypressonline.com/zidebekututojom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_600b4c80b3085.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/679468.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/ohdii24/race_the_traffic_moto_full_mod_apk.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/64554158297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_601711a93cdf6.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/masevewi/agile_epic_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/learning_spanish_like_crazy.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/duraflame_3d_navy_infrared_electric_fireplace_stove_with_remote_control.pdfIn PDF document text
    • http://beviraveda.epizy.com/statistical_mechanics_of_complex_networks.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/zezizikutuwiluruxawo.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/chrome_browser_for_windows_8._1.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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 5108 bytes
SHA-256: b9a9db0df74e74ed5d3948a2a30eaaef9e91070bfa149610bd05452769929ca7
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10264 bytes
SHA-256: 89bcb7c2a9261ccfcc5753fb6c7f3a4374298d0c55559bfaecd2b6468c72a400