Malicious PDF — malware analysis report

Static analysis result for SHA-256 0262c36db5d346af…

MALICIOUS

PDF

69.5 KB Created: 2020-12-24 06:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1c4d2216c974cdeceb28ee59c4e37694 SHA-1: 9babd98d9b4c53de3130181af51e861432c4dd48 SHA-256: 0262c36db5d346af9f28524a83522ec4f8885dc3685d0b09725b3cadf3e4754c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting services. The ML classifier and ClamAV heuristic firings strongly indicate malicious intent, likely for phishing or scamming purposes. The primary attack pattern involves directing users to external, potentially harmful websites through a link farm.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?utm_term=beholder+definition+in+dictionary In PDF document text
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5fc75da2c5997.pdfIn PDF document text
    • https://xosebabonewita.weebly.com/uploads/1/3/4/6/134613761/bigorisirenoxasubele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_5f9898e91067d.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/Wjd6JSh/covid_alert_nj_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379489/normal_5fc4120f90bb6.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/5976629.pdfIn PDF document text
    • https://cdn.sqhk.co/wowedofu/R1Fui5E/25428567762.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/9fe330cf1f7a47e.pdfIn PDF document text
    • https://cdn.sqhk.co/nixuvaxuw/jgTHihf/pixelmon_mod_for_minecraft_pe_apk.pdfIn PDF document text
    • https://rijetebo.weebly.com/uploads/1/3/1/3/131398233/2206494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5fdf09041177a.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/jeKNwii/puwuzanufegisena.pdfIn PDF document text
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/lajugipo_forezegam.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/jfPgh6I/18036894867.pdfIn PDF document text
    • https://pagurewitapusak.weebly.com/uploads/1/3/4/6/134632053/f3aed473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 5084 bytes
SHA-256: cbdd32085842e6bbb716caa45928b0f735638a80a9c69dc9e5278422e4c2a792
font_01_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 10184 bytes
SHA-256: f86e71d0743554669334dd5b1cb6e6176126f62878d0080052a1271a42cd616a

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