Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a4e4c676e7dd4e…

MALICIOUS

PDF

81.9 KB Created: 2021-04-25 09:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b398e7041c36ba4bf8ae86f39df0d125 SHA-1: 752b3a0e82d2df1dda70cab0c24cf45296bf7920 SHA-256: 73a4e4c676e7dd4e497ab428e254ce102259e5763e4b88185dd43f22ee004a40
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 0.9995

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=moldeo+por+inyeccion+de+metales PDF link annotation
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/3943809.pdfIn PDF document text
    • http://fatiberekizibu.iblogger.org/zebasefitujuluzeru.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/99b58.pdfIn PDF document text
    • https://vunivukakuxut.weebly.com/uploads/1/3/5/3/135301202/lowepaguvo_bidogelol_netasixadalimur.pdfIn PDF document text
    • https://gevivefopunuxaf.weebly.com/uploads/1/3/4/3/134331765/wetogademetubi.pdfIn PDF document text
    • https://pixilorazuj.weebly.com/uploads/1/3/4/8/134892738/04f01b1.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/assassin_s_creed_odyssey_pc_settings_guide.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/jiletotisitijoga.pdfIn PDF document text
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/tixutavavu_bavowarogojaput_vizuxewozovajuj_tezixux.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/71335474bd3.pdfIn PDF document text
    • https://luxakanodaz.weebly.com/uploads/1/3/4/5/134589800/mitawoduzukow_kunujugi.pdfIn PDF document text
    • http://pakamid.22web.org/allah_yar_cartoon_hd.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/8063632.pdfIn PDF document text
    • https://subogepaweb.weebly.com/uploads/1/3/2/3/132302814/8261175.pdfIn PDF document text
    • http://tebizutumitus.22web.org/free_apache_tomcat_8_for_linux.pdfIn PDF document text
    • https://xokuriwuboteze.weebly.com/uploads/1/3/4/6/134663839/xobugogulugit-fumunonifenek.pdfIn PDF document text
    • https://tilipigenetuwa.weebly.com/uploads/1/3/4/7/134770736/gikiviworatuko.pdfIn PDF document text
    • https://zadilomevesijob.weebly.com/uploads/1/3/4/5/134581884/lezatazasitojut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duposul.epizy.com/47361959094.pdfIn PDF document text
    • http://nerokigonone.rf.gd/95183843452.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/87850736584.pdfIn PDF document text
    • http://nudozokalegarar.rf.gd/what_does_it_mean_to_be_pimpin.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 5324 bytes
SHA-256: 824a7218a15f40e1a03f19e58a6f1c980cea4e9e301f655740cf9115cbcaab10
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 11508 bytes
SHA-256: 0d6dacbe4f6f6106d52ee9758df2342f058dce52779b041b3289fa587b0a8aff
font_02_sfnt_off00012349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449