Malicious PDF — malware analysis report

Static analysis result for SHA-256 452805e85835f5a6…

MALICIOUS

PDF

77.1 KB Created: 2021-02-22 01:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d363ee2e31916ae02b1b3c38f7ea12e8 SHA-1: 4a01fba93ab278ebc9e4bc8ad2f4633d15495b97 SHA-256: 452805e85835f5a6bcf02d67064cd358aa44852898178189e4f5b669f7d6d5cb
184 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, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs, such as https://yafferge.ru/wix?keyword=electron+worksheet+%25231+answer+key, are designed to lead users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links on disposable hosting strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://yafferge.ru/wix?keyword=electron+worksheet+%25231+answer+key In PDF document text
    • https://cdn.sqhk.co/fexilejedit/f4fgjia/resoxekafakojudujibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_5fe92e32a853a.pdfIn PDF document text
    • http://byt-upak.ru/zijepojufepojewoxq23ca.pdfIn PDF document text
    • https://vimasavugaf.weebly.com/uploads/1/3/4/5/134587410/kotopineta-pedoniwujixojez-xavefavulifuru.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/9252875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_6014778ec0e63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5fd0757b2eab8.pdfIn PDF document text
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/380b9b71e3be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5fd9c13a9ff05.pdfIn PDF document text
    • http://unonatur.space/java_jre_10._0._2q28y1.pdfIn PDF document text
    • http://kieverts.xyz/58493619185nmiz3.pdfIn PDF document text
    • https://femodamokej.weebly.com/uploads/1/3/4/5/134529999/motesaxazi-dipuzofibovawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5fcd2762c3ce0.pdfIn PDF document text
    • http://balifruit.com/997137315166o3ok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizojigijuzad.epizy.com/votajudosagu.pdfIn PDF document text
    • http://ninanupazazudad.rf.gd/mitaje.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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 4788 bytes
SHA-256: 97869a1c79ef18cfab04cfad94e0402a6f4d1831080571394b0aa0c9998939b0
font_01_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 10244 bytes
SHA-256: 123f6bc6d99c8e19756bed216d5bf132f26d26bf9b50c9237ecb7c96e460939d

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