Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df73115ce7d3527…

MALICIOUS

PDF

31.5 KB Created: 2020-06-03 14:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: cf93900c6dc2ce6463028611c2e8f40f SHA-1: 57267c50bb10f5e16b9f29a16b3ba81320ed04f6 SHA-256: 8df73115ce7d352770a78d43788ebbf78f2e57b5fb5df681c00a65ed935a76da
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a dropper. The document contains a large number of external links to PDF files hosted on various domains, suggesting a link farm or SEO poisoning attack. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-8222267-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8222267-0
  • 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 http://sm-pipe.com/uploads/1/3/1/4/131406879/131406879.html#hey+jude+alto+sax PDF link annotation
    • http://warrenstratton.com/uploads/1/3/0/3/130323329/mozumat.pdfIn PDF document text
    • http://koneveljet.net/uploads/1/3/1/4/131408954/1cda458629.pdfIn PDF document text
    • http://stlouisattorney.net/uploads/1/3/0/2/130289581/362765.pdfIn PDF document text
    • http://packfood24.com/uploads/1/3/0/7/130738969/fuvesawiw_fijumukamofap.pdfIn PDF document text
    • http://radioavan.com/uploads/1/3/0/2/130288579/2392580.pdfIn PDF document text
    • http://beasthoopsatx.com/uploads/1/3/1/1/131164549/wozabimobimu-zisakom-bezude.pdfIn PDF document text
    • http://michiganreflexology.com/uploads/1/3/1/4/131437937/9126173.pdfIn PDF document text
    • http://starzbetterworld.com/uploads/1/3/1/0/131070851/1942436.pdfIn PDF document text
    • http://blueraingutter.com/uploads/1/3/0/4/130488445/sotijor.pdfIn PDF document text
    • http://suzifarms.com/uploads/1/3/1/0/131070656/9271983393346.pdfIn PDF document text
    • http://webmail.hermitagefbc.com/uploads/1/3/0/6/130621455/f8029d60c.pdfIn PDF document text
    • http://mta-sts.mx.a1windshield-vinylrepair.com/uploads/1/3/0/7/130776015/5360444.pdfIn PDF document text
    • http://sm-pipe.com/uploads/1/3/1/4/131406879/terms.htmlIn PDF document text
    • http://sm-pipe.com/uploads/1/3/1/4/131406879/dmca.htmlIn PDF document text
    • http://sm-pipe.com/uploads/1/3/1/4/131406879/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bezesevenej.files.wordpress.com/2020/05/33911801138.pdfIn PDF document text
    • https://duzawexosusa.files.wordpress.com/2020/06/72413692883.pdfIn PDF document text
    • https://dojujakukaj.files.wordpress.com/2020/05/38357710607.pdfIn PDF document text
    • https://fabezebi256003415.files.wordpress.com/2020/06/46429589255.pdfIn PDF document text
    • https://sulupazof.files.wordpress.com/2020/05/384023318.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51DF 9536 bytes
SHA-256: f3f4d53fcb06731d243327680c9972df49d70d66c1af8d69ba704e1fd06dcbfc

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