Malicious PDF — malware analysis report

Static analysis result for SHA-256 23253687e001c503…

MALICIOUS

PDF

80.5 KB Created: 2021-04-08 18:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5edbf18732d90d19b1d2408698b61daf SHA-1: 96e3755fe7dc61c3938e9d6dbdc72d059e76eebb SHA-256: 23253687e001c503d1f09910d56412a8b5b623c296e2a14b3c3c8e845943e7d8
186 Risk Score

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://leonvi.ru/strik?utm_term=what+is+rosemary%2527s+baby+based+on PDF link annotation
    • https://cdn.sqhk.co/zarepowake/jcr26ib/kulilituduwito.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/dezusamomuxejinafodikorit.pdfIn PDF document text
    • https://rabivavas.weebly.com/uploads/1/3/0/9/130969809/1476968.pdfIn PDF document text
    • http://cethq.xyz/20831960589slews.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/2397663.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/dapirupisotosamuzume.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/e77d1a7a4e8.pdfIn PDF document text
    • http://laitlabs.pro/verizon_router_default_login_actionteco3clm.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/gcXjajb/pakutililotilupapipipiv.pdfIn PDF document text
    • http://hyipinvest.site/wellthy_therapeutics_jobsc6f5n.pdfIn PDF document text
    • http://migerov.xyz/gaunts_ghosts_the_founding_omnibuscdwbf.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/7jeojfG/aapl_dividend_increase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pusetilomaret.epizy.com/fairy_tales_story_books_with_pictures.pdfIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_91726ac3cceb445eaf91bd13b9abd061.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_4c879f21eab0446c98a270c1e650ca79.pdf?index=trueIn PDF document text
    • http://mezezotunofugus.rf.gd/wodam.pdfIn PDF document text
    • http://bazuteterikop.rf.gd/buzoxodipizaxosojifamumaz.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_b65b56c468e144a284dae7d314a7f8a1.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_d80055ce56254f8fa99e6374d50a69ee.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5108 bytes
SHA-256: 78a50e74f23f119c1d74bd42bddf53127d881adb7357ca6f40acae3af0fa9512
font_01_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 10588 bytes
SHA-256: 60b79f80cb6f91b77ea3a9fbdff0c9bc0c1c341a9e0e111827fb13990396025e
font_02_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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