Malicious PDF — malware analysis report

Static analysis result for SHA-256 e333d29163c1190d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 20:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43a5045679016aa99524117ede08fe14 SHA-1: 7e29d5719ad31648013e7d3abbeb708c0464a652 SHA-256: e333d29163c1190d45ebdf3c3d3ad7429da365668e50ced79eac62d6f7e22991
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a large number of external URIs, many pointing to disposable domains, suggesting a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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 http://asesorgubernamental.com/images/file/berozukudaxelorakibotowug.pdf In PDF document text
    • http://biplano.eu/userfiles/files/39307664146.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/44485081080.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137cca0c6f0a---razibalojepuxibinaxajuw.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109110519036972.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowisotifegotuzolep.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/jimeguri.pdfIn PDF document text
    • http://gibisch.org/files/files/18456687900.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/lovefe.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/42760909852.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/sonagilixugur.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/42958625485.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6718d981c---kotirutobelegepopim.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58399529110.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/99710771787.pdfIn PDF document text
    • http://360global.ca/userfiles/file/43129080795.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/87361035703.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/satotelisigixez.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/63010507317.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/tejuzo.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/tupibovakokogudijunisedi.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/farapufukumaduvomajevitij.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/25755873637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=play+free+games+online+without+downloading+gta+5PDF 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_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 17876 bytes
SHA-256: 5226b9626e209d6f1d6af215a90378bd20c929266e18a05165f0aea08cf483e3
font_01_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 11236 bytes
SHA-256: 31393b51a995df356d871c4d7dadbe5949e0505b2315d89fd8d69e32bded6546
font_02_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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