Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b77fc8cfae3f3d…

MALICIOUS

PDF

71.7 KB Created: 2021-03-01 17:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 41ed9603f034ac9c2e8085abc089481e SHA-1: 995edd96daf92298f3aec69f3579f8b4d053fdfd SHA-256: b4b77fc8cfae3f3d5fde838e0deebf57e94d070eb2d21ca67ac7509fc9d999a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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=lawn+boy+gold+series+parts+diagram PDF link annotation
    • http://luminar4-download.xyz/heropanti_movie_hd_720p_filmywapnzmee.pdfIn PDF document text
    • http://wivejudotimog.22web.org/lutibujijuselikonurumi.pdfIn PDF document text
    • http://cparta.moscow/scotsman_ice_machine_service_dallas3fjdz.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/2925277.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/kafuruxisu.pdfIn PDF document text
    • http://timelessdecorum.com/sam4s_sps-530r_android_cash_registerrvtbx.pdfIn PDF document text
    • http://puwobero.22web.org/tuzixupegugegu.pdfIn PDF document text
    • http://mafujewulig.66ghz.com/aatma_2006_movie_480p.pdfIn PDF document text
    • https://kimimidinom.weebly.com/uploads/1/3/1/4/131453749/99d2f02850.pdfIn PDF document text
    • http://dowator.22web.org/advertising_industry_in_malaysia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fc75b2bc8264.pdfIn PDF document text
    • http://sberpodarok2020.online/tinkercad_windows_7vlehe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490116/normal_5fcdc6ce9e2a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gawekavadave.epizy.com/calendario_2018_y_2019_para_imprimir.pdfIn PDF document text
    • http://toxogeparami.epizy.com/10200710301.pdfIn PDF document text
    • http://kutadomirezo.rf.gd/97226237431.pdfIn PDF document text
    • http://xubaforan.epizy.com/kijuzofuladaviranomujif.pdfIn PDF document text
    • http://gigitepusiligo.epizy.com/wuwisobipu.pdfIn PDF document text
    • http://pugamob.rf.gd/lewavewijoluzutojegopi.pdfIn PDF document text
    • http://sanemogoxidiwus.epizy.com/bekajinidikasixaruma.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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 5552 bytes
SHA-256: 02f91108e27371afef60469fe781141149781965b08b213e705dee29e01b4569
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10124 bytes
SHA-256: 783452aa2383ee119dbc1ca11d00dde5822ae0a628cbb6ec9ccfbe6c954edec5

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