Malicious PDF — malware analysis report

Static analysis result for SHA-256 8736ab7e935d1876…

MALICIOUS

PDF

62.5 KB Created: 2021-02-15 17:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a4684b4415a2164f522261deeaa874f SHA-1: 4db4abfb0f2260cb72dd4df8779193389c8351d4 SHA-256: 8736ab7e935d18760dc7a5eabfa1afba1179131def5986492deced36e81dd502
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many of which point to disposable domains and appear to be part of an SEO link farm designed to redirect users to potentially malicious content. The primary URL identified is a redirector, suggesting a phishing or malware distribution attempt.

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://crophysi.ru/aws?utm_term=kenmore+elite+oasis+washer+and+dryer+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_601d615517fe9.pdfIn PDF document text
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/fidudaju.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/ZLZjb7M/fall_guys_ultimate_knockout_platforms_xbox.pdfIn PDF document text
    • https://rifewageza.weebly.com/uploads/1/3/5/3/135349229/4257336.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/VibihHI/gememamejimuxazi.pdfIn PDF document text
    • http://vizezokope.iblogger.org/horizontal_recyclerview_android_github.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5ff4b39180050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503787/normal_5fc609e872d86.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/borezewuvulen.pdfIn PDF document text
    • https://cdn.sqhk.co/xusorawoka/etNghhe/rock_music_charts_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/jhuhfia/gotozokinomojiserika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baponexar.epizy.com/78471498015.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/63128223920.pdfIn PDF document text
    • http://zivikabazixo.epizy.com/99684705279.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_off0000b9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 5288 bytes
SHA-256: 4a2877f26c3442c61a8eab7b882ad95d37b812302968c0c7aa0ba36714b6ac66
font_01_sfnt_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 9840 bytes
SHA-256: 8037534d9ec9e03a5320a8e56bc618d240e1324b1e39c562b52b1d13c0df341a

Open this report in the interactive analyzer, or submit your own file for analysis.