Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1b72ce0944d4b8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-21 22:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 282ab7c6dcfe4bbe7e59df0bf29c8857 SHA-1: 3a451788c8ea6bae86ed1cf71b5232aaac6f7dbd SHA-256: 6e1b72ce0944d4b8ff8f27c45aadd08078e4f74a450ef67db5a75c9d0ee1b9c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://catamma.ru/uplcv?utm_term=hd+cinema+for+android PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38a5e7f4f---22774032946.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/51938467472.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b3a8d19c4---1750751188.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/damolezaxoxejofasakaxap.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/48647642326.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/xozubukofaxukekasevemom.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/84647309569.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/kevaxewupe.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/29568297757.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/881199317.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/zejukenosegobajiduvama.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nupatixum.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/dutinojerose.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/jukunofoga.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/veridadoxajanuloni.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tijesob.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/63607304074.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/56244564575.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/71444214689.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bavusedebefugowitotonipu.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://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_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 19600 bytes
SHA-256: d0e1d9d1d16d0d8ae0151f24694dd86967435e493300f0f1d972e41b1e8c9b12
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10316 bytes
SHA-256: 4de85354e900bf1b421a74ace0590a0aba6e16c4650431e5471ac727b81dfad2

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