Malicious PDF — malware analysis report

Static analysis result for SHA-256 573c716bafd8213e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 11:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bc1d7d7ed48f2d0392e32f7df1c4b45 SHA-1: 93ebbaa8acf6ceb6335e42db89742dfbb58a3391 SHA-256: 573c716bafd8213efe585970542952429e8896a424f06031b2a896a20f45b514
74 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 disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely serves to obfuscate the malicious intent or to facilitate the redirection to these external links, which in turn likely lead to the download of unwanted software or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=moviebox+pro+apk+android PDF link annotation
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/xajuxulovugot.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kiqbivbtvritebkv3kbvcmncqd/kigulof.pdfIn PDF document text
    • http://alkanboya.com/files/file///rinutopidifudofiv.pdfIn PDF document text
    • http://ropesadventure.com/d/files/dodonumanakomuvekovi.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/21964872807.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/gewozulomiwodukafo.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c537aabff5384ecc61d86954367cbd93/xolotulatamenagesurulokim.pdfIn PDF document text
    • https://blogsma.com/files/tudonavufenipakamezavi.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/tuzubesoguradok.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/vubitami.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/19578745756.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/95124815406.pdfIn PDF document text
    • http://osayit.com/images/file/12885990846.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/kagimoxavutapuzefu.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/52215933574.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/tebovivij.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/67345797246.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/41867885370.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/72929599203.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/kezadu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/84352661737.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109070356505969.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_off0000be7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7B 17772 bytes
SHA-256: b247fc6c165bed9f0150b3fb07f745a7c1eaa87771675a2a81ad867584f71cfe
font_01_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 10464 bytes
SHA-256: f67747516d7429e03053c89302d86e593035401b84e397cc8630481bc1532567

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