Malicious PDF — malware analysis report

Static analysis result for SHA-256 83be2fbcf03c0a26…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 20:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 10eabd82c9e9083d7c10282cd1904162 SHA-1: 30c9e85eb2d5d61558cccf0aad9aa84101541818 SHA-256: 83be2fbcf03c0a265ec5e9430aee996581195d275bf0228791fc3ae01309b069
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content distribution network. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://leonvi.ru/wix?keyword=chem+21+labs+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473035/normal_60334f3893d58.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/ijdR2hh/girl_war_z_hacks_pc.pdfIn PDF document text
    • https://pimefukidipobe.weebly.com/uploads/1/3/4/0/134096137/9717754.pdfIn PDF document text
    • https://fotovotujipibar.weebly.com/uploads/1/3/4/2/134267097/ad20988108464.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/Z4Rr3f8/find_my_phone_free_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5febcdcd227d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5ff3cbc581fd6.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/does_humidifier_really_help_congestion.pdfIn PDF document text
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/debajujuralir_fobexij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_6039db06c90e1.pdfIn PDF document text
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/189355.pdfIn PDF document text
    • http://ninijefaligogi.mygamesonline.org/vegefil.pdfIn PDF document text
    • https://batebabegusuk.weebly.com/uploads/1/3/1/4/131437625/sasigojurigilod_sulatikajakum.pdfIn PDF document text
    • http://www3.chem21labs.com/labfiles/UofC_GL22_Lab.pdf?rf=3899In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lewuli/rukewivisof.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/94348636070.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/6070561478.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/12176190332.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/hp_photosmart_5510_scan_to_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/32150912114.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/latest_android_smartphone_under_8000.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_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 5244 bytes
SHA-256: 0ae212f91f611e462856a172f7b7b9098fb12da833867084538369aaf51ece0a
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 11016 bytes
SHA-256: 36f9cfc153b7cc0c107bf757dacca995098599b8f244e4c8fb4355e257434e5d

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