Malicious PDF — malware analysis report

Static analysis result for SHA-256 21be394dab2c53f7…

MALICIOUS

PDF

76.8 KB Created: 2021-03-14 18:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 30bbe479a2d03b81188ae3cbeef5b4bf SHA-1: 8aa158d0faed135d27cb22847b2d301b711159f5 SHA-256: 21be394dab2c53f78bb68bf11e80a1ed9b964fbc3ccfc4b904ed4a87ca12cef4
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=how+do+i+sync+my+x1+remote+to+my+tv PDF link annotation
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/0d3f9a5f3b822e.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/Sxjb0jg/love_stickers_for_whatsapp_iphone.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/guzuk.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/zoom_g11_manuale_italiano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fd05f0db54aa.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/ha5kijq/domino_effect_examples_in_real_life.pdfIn PDF document text
    • https://cdn.sqhk.co/bureruverog/iihcm46/facebook_analysis_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/ibihDjj/54685187194.pdfIn PDF document text
    • https://vepezoroz.weebly.com/uploads/1/3/4/6/134605761/dibate.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/lufakiga.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/jcjbigI/moruwufanid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_6033057d38f91.pdfIn PDF document text
    • http://bezugunafagomup.22web.org/luwinavewuvikiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/bogonelemid/PY3LIje/bgcse_answer_key.pdfIn PDF document text
    • http://bamuwapinofaro.iblogger.org/tmux_cheat_sheet_for_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_602212e1e56b4.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/5652002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421768/normal_60243da62f7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_5fe8cfbb37063.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/UIqEsic/juventus_news_24_twitter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newabef.rf.gd/bapupikuvitonabuk.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/26171961429.pdfIn PDF document text
    • http://gamujid.epizy.com/wowumobiniwosegiv.pdfIn PDF document text
    • http://fobapisarut.epizy.com/avanza_g_2005_manual.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_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 5180 bytes
SHA-256: 951bdf3856e5951b1ba6254d2727d5c87bd0fd642f13971c54145334c4732a7c
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10572 bytes
SHA-256: e32ed1accc999df7114dba2c1f559eb84175835243e2dff66d53fb628901f15d