Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf67ef2d1592dff4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 22:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab58e9943895b3038b5a8faa20f08d87 SHA-1: f68c189771128d879ff362659bad6a18a121e0ac SHA-256: bf67ef2d1592dff476264b0848fcce24d96aa97bc436b6c45b34cf7cec734df0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cambodiaangkorhomestay.com/userfiles/file/doroke.pdf In PDF document text
    • https://designclarf.it/file/velanuwexisowodef.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/62266886556.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/64612303815.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1479008577613341ac4f4e2.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/rezemumuwod.pdfIn PDF document text
    • http://clerus.hu/files/file/voxumoziwupolosaw.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/40417656008.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/xudemajesisepuvogab.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/86976418920.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/83419151331.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/mixed.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/dadivasitisu.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210914172114.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/40448891631.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/tumarap.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5fd38c1acf4ad6d1e0dad21e6be544e6/junidijulelisogazolubim.pdfIn PDF document text
    • http://dominant.name/userfiles/file/92456662760.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210914_124827.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/pajituxa.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/52492288212.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/92423446720.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/41871957600.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/janejoganolavaxugoretobu.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/dosemalexusojifire.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/jimivuriredunebefamufu.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///mazomirujasarilezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=9+iron+loft+anglePDF 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_off0000c697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 15980 bytes
SHA-256: 2b96ce21495e125076f39452834986855056ed9c6fc3783d69d891773697de17
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 10292 bytes
SHA-256: f3affceaae489af201e481a99b0a4c7e596b7bf8bbe6d120dbf179a8d6d7f714