Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a3dad68eae77d3…

MALICIOUS

PDF

82.1 KB Created: 2021-04-08 18:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2ae8cadb89dc656fcec65a966f9dba8e SHA-1: 2e334684090c15f06a179dab09372af963ea3d41 SHA-256: c4a3dad68eae77d375b6c139f6f8c6ab93aad10f81701ba7964f3fe81023da53
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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
  • 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.
  • 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://soxebez.ru/strik?utm_term=new+york+manhattan+map+tourist PDF link annotation
    • http://iwhite.space/dungeons_and_dragons_movie_free_onlinestvxl.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/dCZbKja/general_knowledge_quiz_with_answers_multiple_choice.pdfIn PDF document text
    • http://4338bacchus.com/73687759245w1qn1.pdfIn PDF document text
    • https://cdn.sqhk.co/lovaxixifew/OBN6iei/99959419318.pdfIn PDF document text
    • https://paxubemimowam.weebly.com/uploads/1/3/0/7/130739876/sokevuxegebedekofe.pdfIn PDF document text
    • http://repochka.site/pemuli45tqe.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/marlin_60_review_youtube.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/dolufosi.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/igdhbid/pupalazilikafokalenup.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hwOOK4n/download_meteor_hammer_io_mod_apk.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/6e2ce54c38e36.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/71818684773.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/ewAQhaP/saribigakoxivimeruj.pdfIn PDF document text
    • http://pixell.store/segigasrep3t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/50783925291.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/hepa_filter_data_sheet.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_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 5252 bytes
SHA-256: 319739af8b305c05750a21ed5e5e3f0578c9e1c83ccea3fca0ef9a93243ba4e0
font_01_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 11528 bytes
SHA-256: 910c625a28b11caeac4cb0b74a76d48698df0c414a24834a09693725cd425715

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