Malicious PDF — malware analysis report

Static analysis result for SHA-256 233f206f622452fa…

MALICIOUS

PDF

73.2 KB Created: 2021-02-18 14:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9b35c316d8525bd476eb39b88c00c13c SHA-1: e901802017a8bc36eb4c5f00976f41ad08de723c SHA-256: 233f206f622452fa05a0ce29bd74f2736910a50e1fd6470ab228147e32fa1a6e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation attempt. The ClamAV detection and ML classifier further indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious sites.

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=blue+jackets+vs+blackhawks+2019 PDF link annotation
    • http://chambrely.xyz/g_shock_gold_metal_watcho9n6v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fe30ef44c5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5fe8a33490413.pdfIn PDF document text
    • https://laxatutokowo.weebly.com/uploads/1/3/5/3/135387201/5660fac4eee0cf.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/89773691506box4z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5ffde5361d998.pdfIn PDF document text
    • https://morisefomu.weebly.com/uploads/1/3/0/9/130969566/f9a5a08e1a.pdfIn PDF document text
    • https://lizoxezubim.weebly.com/uploads/1/3/0/7/130776499/4fb084.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/miloxakanumu-zisukuzu-zutadejale-xotivipoxusaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_600ec2047f339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fdc1e92bd539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487413/normal_5fc8e8272027a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5fe58fbeb9cbf.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/sifawekujiki/rorud.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/inbound_certification_hubspot_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/ansi_c_standard.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/sound_cue_sheet_example.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/90495418892.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_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 5756 bytes
SHA-256: 0cd6debd6c460637e0c00e91082aa681bc9cc3e0b524c1bb515feef253c8236d
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10612 bytes
SHA-256: fd678ec3518988d154344fdede804e8bb084ea0c336732c6af7adf8fc0bdd584

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