Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8b6b379d8c2e45…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 05:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d7ba5cfc5147065445a3ab62ae8c9632 SHA-1: bb8248b8313d1bd3ca030fb58c91f9b61d40086a SHA-256: ba8b6b379d8c2e4589f97ea01fb8b7749251bab077a6c20074ee2b141e55d5ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=live+football+tv+app+for+pc+free+download PDF link annotation
    • https://luatsuavina.com/userfiles/file/28269796730.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/kafekidatopokepis.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/26695172534.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/wekomejivezod.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/12346805943.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/10923301653.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/fesusebubugutezab.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/94879153522.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zuvololevivip.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/41647755958.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/gekesatolelofobiledateteg.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dojisefififuzijuwo.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/bomivaji.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/babusimokadiluwukara.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/mezesijijivonasaburuzum.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5cdbdc23f05f5b505d0a6583fe78b23f/52283423031.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/zewisem.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/zanalavoreriwuwen.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/5604187990.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/bililomakewukipozo.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jemejawizexi.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/dejuvuf.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/65099316119.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/degabotewedafizibubob.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_off0000c638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 17544 bytes
SHA-256: 591dc2f245c7a0b8e67c5710c4062b6c02c9fe872a5d8140e775c3310832a4c3
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 10696 bytes
SHA-256: f66c75835c08cee8bfb58415f04dd5a89fdbccffe91ad086d019f750bf4a8f50