Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f5cc7c91030461…

MALICIOUS

PDF

98.0 KB Created: 2021-09-16 08:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87b7d41fc5e78f3be40da9d0fcb44b33 SHA-1: 294fc5045de2c2c3e637ce52bdbf1c38d890adcb SHA-256: f6f5cc7c91030461b0a04b7f0c7efbfd871526b9bec890df3dc7347b518d8440
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=c%2B%2B+in+action+pdf PDF link annotation
    • http://metalzilembo.it/userfiles/files/budadopufapolijakumijowo.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/19689148132.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/vagovaboxurolivikunozuwaz.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/zeparixisojan.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/mifigevupekejorabapuj.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091407503773499.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/buligaxa.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/gigixezeduputuravoxewug.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/8601306426.pdfIn PDF document text
    • http://eichler-kammerer.de/73722238918.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kibudugun.pdfIn PDF document text
    • http://polletnv.be/uploads/files/moxagugoginekalelenujobuj.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/88795673565.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091518004333.pdfIn PDF document text
    • https://norservis.info/files/files/dizijeputukazizurutabojig.pdfIn PDF document text
    • http://analhospital.net/file/files/4907471255.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/92419711068.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/niguxabonululomop.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/59460788238.pdfIn PDF document text
    • http://pneusmarene.it/images/file/58204849759.pdfIn PDF document text
    • http://samtekelektrik.com/files/sadimebidopelafipagaz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e655a45753---2159745871.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/genodologabisamitugusudu.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/5216765373.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_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 18096 bytes
SHA-256: 8e9dd3f0a8ef092cec3f3edc90f2711160b5f6525fc3d6eb372252f216692fe7
font_01_sfnt_off00014b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001637d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637D 10200 bytes
SHA-256: 75a5378baf80c810cb15a3cb4380cdf8b93c137aaeccb62a89a13fceb226444a