Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba6ac1aa3ec2b27…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 08:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 126354a247ff1892a2ad22646d9f429f SHA-1: 309da2d90d52838cbfc867bc8f2975978c17b06c SHA-256: 1ba6ac1aa3ec2b2723170831f6cee0dbe6138b5a42069c82021f1a425905ce7d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aihr-iadh.org/uploads/FCK_files/file/29045186166.pdf In PDF document text
    • http://be-now.pl/userfiles/file/ramutufijikon.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/79759801882.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/55855592752.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/pewekagebikijemuki.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/muzajagabitulu.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/3207126304.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/58642686231.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/kelomajuviwunoroxu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427b7fe282a---busizefugusanow.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/82990035971.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/jofuv.pdfIn PDF document text
    • https://nyig.com/files/file/62385694053.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/63043619318.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/85066595361.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109082345325285.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/vejiwedem.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/tajiturizekeve.pdfIn PDF document text
    • https://telenovella-bg.com/files/53646492644.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/25508192677.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/22083798309.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/42513416566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=group+call+in+botimPDF 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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 20188 bytes
SHA-256: 6e203fea55e7822414a76640c98753f9df9cd5a8acbfbd2c5146ed4bf22365cd
font_02_sfnt_off00013536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13536 10512 bytes
SHA-256: acff9e38551b4a7229d0449338eb4483f001e17a646b970f6d2257f2ac2b6731

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