Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b51855e1611746…

MALICIOUS

PDF

65.3 KB Created: 2021-02-15 13:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5199b0d129c73ff2818b9c7ba4fe8541 SHA-1: 21ed277ae0546ff1934c8eefd1516eb285f4eb16 SHA-256: 58b51855e16117466462945df9d6fe9078f60c32f39fda46db0e6745728e7755
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a high-severity 'PDF_SEO_UTM_REDIRECTOR_LINK' rule indicating a free-download phishing lure. The embedded URL 'https://jacksth.ru/strik?utm_term=ge+xl44+oven+specs' is likely the initial landing page for this phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jacksth.ru/strik?utm_term=ge+xl44+oven+specs PDF link annotation
    • https://cdn.sqhk.co/wazafanez/OB6gjjd/wujuwev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485696/normal_600598da476d3.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/1617929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426080/normal_6000d7c4be6fc.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/ijdZPBz/74430894169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403264/normal_5fed1a87178cd.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/bgd9jaS/educational_steps_for_informing_strategic_planning_in_healthcare.pdfIn PDF document text
    • https://cdn.sqhk.co/jajejige/7NAhdjf/60827249458.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/6093231.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/9j4zig3/airtime_loadup_scanner.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/bzjdlgj/dagilenibe.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/tihhesR/virtual_running_events_for_charity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonowazibekaz.epizy.com/proposal_penelitian_akuntansi_sektor_publik.pdfIn PDF document text
    • http://xaxidos.epizy.com/alphabetical_index_template_word.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_off0000c301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC301 4868 bytes
SHA-256: da7d101ad7bc44382bf92994ff3905640c95cc516c0cf1f74500441330b79f5a
font_01_sfnt_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 11044 bytes
SHA-256: 4d4b4feca36e8920e2a2c40ac1fac50b816d864744232443cf83f9a012bef13e