Malicious PDF — malware analysis report

Static analysis result for SHA-256 4653f0ef2da9f1b4…

MALICIOUS

PDF

70.9 KB Created: 2021-05-18 01:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1aba0c09a5ee320733b528306cd8fc9a SHA-1: a1f727169e1175766c4cdb09a814c35c2f9e13a3 SHA-256: 4653f0ef2da9f1b4dc8677d5f223c0dbd072930feb68706c371abebccc65f64c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL (`https://golowaki.ru/strik?utm_term=ejercicios+de+condicional+en+espanol+pdf`) appearing to be a lure disguised as educational content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, further supporting a malicious intent.

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
  • 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.
  • 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://golowaki.ru/strik?utm_term=ejercicios+de+condicional+en+espanol+pdf PDF link annotation
    • http://verekozugotised.22web.org/34537396231.pdfIn PDF document text
    • http://foteraza.22web.org/3_branches_of_government_worksheet_free.pdfIn PDF document text
    • https://bonadamoge.weebly.com/uploads/1/3/4/0/134000068/pifivuzadodaw.pdfIn PDF document text
    • http://kadesevi.iblogger.org/ramaguwafutudufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481062/normal_5fe5b8c4935bb.pdfIn PDF document text
    • https://devogenigibef.weebly.com/uploads/1/3/4/5/134501446/492709.pdfIn PDF document text
    • http://fadomofikupiviv.iblogger.org/nunedovizufijat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490273/normal_5fecf1b4e08a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesojowikodojaw.rf.gd/siemens_thermostat_rdj10_instructions.pdfIn PDF document text
    • http://jobubiro.epizy.com/75153669307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d048f1a7-4d16-4205-bada-5094f83eb054/bovizibobabo.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/ark_survival_evolved_dino_stats_guide.pdfIn PDF document text
    • http://domusas.rf.gd/definition_agronomie.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/92683143575.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/97950023319.pdfIn PDF document text
    • http://zexiditakobo.rf.gd/bidejativosolotetejixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f538451-c938-4e13-87c3-1850f0f98419/xepefokukezenegoroko.pdfIn PDF document text
    • http://xofinawudira.rf.gd/tripartite_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf01e27-b885-4672-a9c8-667327972490/research_proposal_samples_in_education.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_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 5180 bytes
SHA-256: 94682e733d51c43b4663a268628126a1bae8ce78d1f76f6f4115d40597c87d86
font_01_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 11868 bytes
SHA-256: 70a22ac53a5140967a401f39ac4ea7ca7dce0c9c07cc50aeedfdd1f22c8813ea

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