Malicious PDF — malware analysis report

Static analysis result for SHA-256 18127776c1ab96d4…

MALICIOUS

PDF

77.9 KB Created: 2021-04-09 10:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e552e5f82156e160d0612d9882542da7 SHA-1: 50d8bea5c1fa1af735917ab3c33ecb57bc1652bf SHA-256: 18127776c1ab96d470bb6392ec3114e25f2f5a3daea36731824aaf5421e7b28b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://xajibur.ru/strik?utm_term=watch+alex+rider+tv+series+free PDF link annotation
    • https://cdn.sqhk.co/xusorawoka/ghjgcgY/using_affect_and_effect_worksheets.pdfIn PDF document text
    • https://dotofopig.weebly.com/uploads/1/3/4/3/134307416/siluzidefiwenam_mosili.pdfIn PDF document text
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/3904611.pdfIn PDF document text
    • http://whowill.ru/19694697195pd5j6.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/Pwjge89/weather_forecast_for_10_days_uk.pdfIn PDF document text
    • http://temilops.xyz/how_to_replace_mobile_home_furnacefa6k6.pdfIn PDF document text
    • https://cdn.sqhk.co/zirimikuj/bjZjfji/99021808969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4134604-227a-4d01-aa30-07dce2821415/2005_cadillac_cts-v_rwd_specs.pdfIn PDF document text
    • http://lujarozukivexoz.epizy.com/apache_tomcat_7._0._59_error_report.pdfIn PDF document text
    • http://nazifaba.rf.gd/basic_geometry_worksheets_for_grade_2.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/73106018812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d62b895-8f8a-4e23-a085-833781790e16/bash_script_load_environment_variables_from_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0a81d6-3b82-4f52-988d-3bb2cc674cd5/muwimidulugagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa14bdf-4c5e-4fdc-8585-8d0e3305d152/72339822093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5818bc-b98b-4295-a27b-6e09ca100793/xekaxakelomofuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc7d3e2-bb99-4e8c-b13d-5b65ce02a909/13271271542.pdfIn PDF document text
    • http://kosidigipetuvu.epizy.com/sovil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b394346-cedf-4ae9-a698-a0db9208c683/95964489569.pdfIn PDF document text
    • http://lotawegikuk.rf.gd/92360126968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8065331-95c8-4d84-b446-df8d22d67c1f/sibelius_peer_gynt_suite_youtube.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_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 5252 bytes
SHA-256: 29f116cf92616a8d4b7503a94fd005da70dbc3ac1f33a16007f78dcfe184ed7b
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 11092 bytes
SHA-256: 31a0d68571e033a7d71a582c4d77505b97e213803ff0b1d7e628325c74c824d2

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