Malicious PDF — malware analysis report

Static analysis result for SHA-256 2189ea2890fad8a2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 23:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b44941234b2adf6e96b453b1d45e500a SHA-1: e840b0d80137de150e8ea73d7975e44f6ca65e0e SHA-256: 2189ea2890fad8a20a8e3fc6f3c967895ee889d650e311109cb9a61825f28243
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://everestlodgelukla.com/userfiles/file/26029000140.pdf In PDF document text
    • http://congtrinhnhaviet.vn/upload/files/75815233062.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/65998584500.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/29894620129.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/rodejagumufowodirim.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/20554558814.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/33138208482.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210904023528.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/mizexelo.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/1425418249.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/69931918249.pdfIn PDF document text
    • https://duel.pl/userfiles/file/54481060883.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/romosarumavosuvaku.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904075833.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/soronenimiwinusik.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/53626548271.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/dumitira.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_AD76468AC6DC460B.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/438073041.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/91057947164.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/16000654672.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/sibekagadavifabazoriwudam.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb0b09428---datafupetetip.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210913_2A3EB3453A05789B.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090911591573499.pdfIn PDF document text
    • https://virker-ikke.dk/files/xexediruwaxebej.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/14580923951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=grand+theft+auto+3+freePDF 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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 17776 bytes
SHA-256: ca1a63e8ea9915011352ff5a4a3a26b115560be46d3da47decdb8db77f5c702d
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 10456 bytes
SHA-256: aeba138f6484ca231645abd437c4f03a261248777e3d249e9346329fefea144c