Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f4a9701eb8eac6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 14:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 714153a95dc53b199f27fda57c0c8993 SHA-1: 8a569517ae1337c15fcc39a5c884dba62cf8b1f5 SHA-256: 05f4a9701eb8eac69e6e6a4a443748a6fe9c789ed31026f69d3c3a91bca6bc17
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 part of a link farm hosted on disposable domains. 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 0.9912

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 https://namhunglogistic.vn/site/files/tixedi.pdf In PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rilexuduxoliwasal.pdfIn PDF document text
    • http://canadianrockies.info/files/file/17468999021.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/32998430104.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/fefomir.pdfIn PDF document text
    • http://kit-veron.my/ckfinder/userfiles/files/nisazexajavafodefo.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/jezezegigo.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210913034900679600pvr3w547yd9i.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/75368634260.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/88359754819.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/95388864796.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/devire.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/40136467008.pdfIn PDF document text
    • http://novichiha.ru/pic/file/nabojolijorusagisiket.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/43fef3fcd72e626cb8ad7a89a3aebfa1/gulubibaxevexapotoxeba.pdfIn PDF document text
    • http://topflexsports.com/uploads/sozaxexigadafek.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/36777649479.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/81822566841.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/98420673972.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/jifigat.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/81840140280.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/suneditepinugen.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/36798844836.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/sitexebeni.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/mariradi.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/68316494143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=unable+to+set+up+google+account+on+androidPDF 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_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 17844 bytes
SHA-256: 162e769cc942540478c347397a4758b5a8c009e1e6950444c879b5cf061e842c
font_01_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 10936 bytes
SHA-256: b896fee5f5b488ab6de16643dae731cfa214102586a8864ff8a51e7f1f398443