Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c2805ee812bf7b…

MALICIOUS

PDF

78.1 KB Created: 2021-03-21 23:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bd74bc374dd4f8677fef27787c45e5f5 SHA-1: 523643de1e38e8835656d4c1fc4df54ec9519ce8 SHA-256: e8c2805ee812bf7b67822b74b332cb1d7798d3bea70db094f27fec2a98018be1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jottigo.ru/strik?utm_term=blackbird+jazz+piano+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461249/normal_604dddbb779ef.pdfIn PDF document text
    • http://nusamovepi.22web.org/11055880022.pdfIn PDF document text
    • https://gojanaribebiw.weebly.com/uploads/1/3/1/4/131437307/bejupoguba.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/misodatifoxas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485801/normal_5feb29750615b.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/best_buy_black_friday_ad_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_6018f4aecd6aa.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/7250444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5fcc84fe9293b.pdfIn PDF document text
    • https://nulowuze.weebly.com/uploads/1/3/4/6/134614321/c76de8ec7831a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_601e701ce507c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazorilumi.epizy.com/ralenujopaluwuzuwejik.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/nivozepoxibobijuzotura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06b77d4-5b89-42a5-a32d-081f663bca22/sawisonapojarala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80fc615b-745c-4992-a580-b31d215176fb/nepajak.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/ghost_in_the_machine_bob_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e878db7-5140-475d-b4ed-6225f95f139f/sokuseki.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/nojafoxikukofivafoxapu.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/reporting_suspected_drug_activity_uk.pdfIn PDF document text
    • http://bubobebetoju.rf.gd/bomagojineguwix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c911b10-54ce-48db-88a1-24261c33d31f/pandas_tutorial_jupyter_notebook_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d090c256-a0ad-4923-ba3f-1309fac35473/did_dish_network_increase_prices.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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 5692 bytes
SHA-256: 64c8ee60bab2af37ceb7c3f41c13c93b8f9691ed9e50b73ec33e1430d43151b7
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 10704 bytes
SHA-256: ad55994d384b0dad44ff145b4c4e70ee283349c55e12567af5d11f4af905ff43

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