Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3992a7c8ae2eae…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 04:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4a6f63b5a24503c2b4fbc0a80b4f65e SHA-1: a6eb7d54335342e12fa54c74f164a187fbfcdd2c SHA-256: fe3992a7c8ae2eae9a0864bbff3ec3ffe5c2892e5eabca5fcd1f2f8fc4266709
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the presence of many external links point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jhdjt.com/images/upload/File/77965723138.pdf In PDF document text
    • http://clairvoyantinfotech.com/demo/images/kofatopul.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/32937679858.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/65531642662.pdfIn PDF document text
    • http://rinsacars.com/files/others/32706552105.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139713fa12f3---tosuvutasanonafitumit.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/61564049336.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/16014319350.pdfIn PDF document text
    • http://halmar.info/userfiles/file/perirepazapimamizusoja.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/85978520725.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021981925366377.pdfIn PDF document text
    • http://ingore.cn/upload/files/gamarafopix.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/63101377078.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xavetesojewi.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/45286670390.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/mesumowafavasusizuful.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/59250667247.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/zepawivotuxariw.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/17796473531.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/14493702644.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429a718737a---66798435323.pdfIn PDF document text
    • http://napiarsaigh.com/images/lalefozi.pdfIn PDF document text
    • https://sapporopools.com/contents/files/mebogaberiretumemudoza.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/gafijutixagoxufifurawozuw.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/nejazazibemexiwek.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/65745034438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lloyds+introduction+to+jurisprudence+9th+edition+pdf+free+downloadPDF link annotation
    • 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://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_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 11272 bytes
SHA-256: fb549ed87bee7bba5af404f52a6e50c7ed03de6a64d80bd75af93e063362ea25
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 17420 bytes
SHA-256: e829d1105e0ce2ce7a20cade1fb8d0c914d765e8e2ff725f66f2cd96d9be33ad