Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7b769a82dbc41f…

MALICIOUS

PDF

76.6 KB Created: 2021-03-18 18:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8fb1bf8fc578a0dca61b3f767c92e4c5 SHA-1: 0da0ccc72c95503474f578a536183befb44b7edf SHA-256: df7b769a82dbc41fb3eb06b3f01dd037fddac78193d1bf96633b00ac4fc71e24
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+calculate+p-value+from+f+distribution+table In PDF document text
    • http://jowigosut.iblogger.org/4682736014.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/8732220ba4.pdfIn PDF document text
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/7780858.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/kibupilukukelumif.pdfIn PDF document text
    • https://zuxomizo.weebly.com/uploads/1/3/2/7/132710603/ziwafenokut_zomuwip_xaxiza_rakuma.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/jamejalibonupi.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/bekopozaraviwelonaxuri.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/wogekujoz.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/3805707.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/tixeruk_lopuxazokun_tiwezerumedaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/intermediate_marksheet_2018.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_2f761fd67f174b74bbc87b8ce082412a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/fabogawojenilowadob.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/68175374976.pdfIn PDF document text
    • http://wuxodevidupibe.epizy.com/nevuzenapolusopi.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_99c56b28c7c749af84fbc605afefec90.pdf?index=trueIn PDF document text
    • http://gugamofizuxeg.epizy.com/brioche_roll_nutrition_information.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_57d3caa67481493c8c17a218efe53e10.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_098dbdcf7ad64157876d860b54fbea81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/wixusal.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/12388193455.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_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5584 bytes
SHA-256: aae69abbbb19d6d349ef6a117f174ca27addac651ee81aab76f395262eddb768
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 11808 bytes
SHA-256: 0da656f03a4c1b078d0408eae32fa0d6905ef45c757feb7f638ff6727c9e6746

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