Malicious PDF — malware analysis report

Static analysis result for SHA-256 44069037720910fa…

MALICIOUS

PDF

71.3 KB Created: 2021-01-26 03:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 86c61dd3bab96dc656a0fef2e0eaf55f SHA-1: 9cddeacf737985502ed69c152d2687f1a7494755 SHA-256: 44069037720910faec885205d96da3c4861930d06d8d37bba726a10ea2ae3eb5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, with several pointing to disposable domains and potentially malicious content, suggesting a link farm or phishing operation. The presence of external URIs and the ML classification strongly suggest it's designed to redirect users to malicious 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://leonvi.ru/123?utm_term=graves+county+jail+inmates PDF link annotation
    • http://testvvd.xyz/117000121784wy3x.pdfIn PDF document text
    • http://tersq.space/horror_amino_downloadqoifw.pdfIn PDF document text
    • http://pitushok.space/64906502405buqe.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/aOXriaj/94010945941.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/akjcwvi/capitalist_monopoly_online_game.pdfIn PDF document text
    • http://lnstagramsecurity.net/pedesivowawadedok36shk.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/Mjfibge/fupubazag.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/gh7hjsb/descargar_the_pirate_plague_of_the_dead_hackeado.pdfIn PDF document text
    • http://sudiwemubitep.22web.org/xojomazeluf.pdfIn PDF document text
    • https://goreduve.weebly.com/uploads/1/3/2/7/132740848/3072ff2854.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/sukobogixe/rojajikelifonapuvogesolo.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/kulumidozorasagu.pdfIn PDF document text
    • http://dawutanarav.epizy.com/best_swot_analysis_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/japan_guide_jr_pass.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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 5212 bytes
SHA-256: a4f0e9ca655fbe1e00fa6a7f160b223e47d30daf444be49d9b3f1145a9cfb6a8
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 10864 bytes
SHA-256: 1c085bad7da809764d489a7579da2cb03aed8e1a9c600f9a0bcff7fa719d3b02

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