Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fad4952d3d3212…

MALICIOUS

PDF

74.9 KB Created: 2021-02-19 18:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 852f4cf8bc017cdfd66f1bef26c47065 SHA-1: 4902ee3f9970da142a0ceb684e4291b74046773c SHA-256: d5fad4952d3d321207c2acfb9ac3434adc2f5d4e71ed17a219b20a6d569b7b73
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://leonvi.ru/strik?utm_term=is+crossfit+level+1+test+hard', which is likely part of a malicious campaign. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and the ML classifier output of 0.999843 strongly indicate malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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=is+crossfit+level+1+test+hard PDF link annotation
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/gavenenutekati.pdfIn PDF document text
    • http://copyrightreports.com/a_happy_pocket_full_of_money_download8g35t.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/610ac73808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_60093e9089bfd.pdfIn PDF document text
    • http://gopefafapojawod.iblogger.org/liwodopogedin.pdfIn PDF document text
    • http://fuwenosod.iblogger.org/maganuruzizexexasadudel.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/bavokukad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_60018d8b2a4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd1d20d88e62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5fc8abb79ad92.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/bajapovogam/26083131774.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/44619283288.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/news_world_report.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/kurefuxifesezaxijukolurij.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/13702186287.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/pekamuguximini.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/sepesi.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/daligarukurumuz.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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 5160 bytes
SHA-256: ed7d9aa2c84861c8cbdc25999f64c99d43886d460663d9778239d5b174fc13cd
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 10796 bytes
SHA-256: 6cf05a213856fc6a3697e3e75fc2ca08784b08204cd6af09319b4e9668b5077a

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