Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7f634754ef15d0…

MALICIOUS

PDF

69.4 KB Created: 2021-10-09 16:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9cce14602f266116c2294704511fea5 SHA-1: c77dbc56d068f25c4a4ccc85cb1a72c8fbc80671 SHA-256: fa7f634754ef15d02b4869fcd43d55dbe03097dc95384201f2ad72d1683cf658
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a campaign focused on manipulating search engine results or distributing further malicious content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=discuss+the+characteristics+of+accounting PDF link annotation
    • http://heathrowairporttaxi.website/userfiles/file/wolakozojaziresif.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/gesifijumeme.pdfIn PDF document text
    • http://chicopharm.com/upload/files/37285053194.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/jijatimeja.pdfIn PDF document text
    • http://bndweb.nl/upload/files/wenumutadobad.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/29135925280.pdfIn PDF document text
    • http://kraciowka.pl/userfiles/file/97734945257.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/vokefizakufa.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/veverexojakodanew.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/ritadebefasofez.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/90326620600.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/velopijaj.pdfIn PDF document text
    • http://hocomesun.com/upload/49816716866.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210915/files/20210915162355.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/tefakunere.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158f6e5ca113---luxuxelizaxiragunug.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/selinopireriganunikox.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///pujomadororevobemugofej.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614404e6019c5---bepomejalofukow.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/zotozegikojupuxalitev.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/79341829510.pdfIn PDF document text
    • http://espokebar.com/uploads/files/55478327471.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/vilik.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/morobilefimexavatol.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/begitiwatofari.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_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 10672 bytes
SHA-256: 49198f2065a72e3d90a8cf1ea5cd1f5291acb2fff87b330aa9da3fd41331eb3f
font_01_sfnt_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 14448 bytes
SHA-256: 2c9f3167987d7531a81356c49d432c768e6c8c4621761232d42504112d91886c
font_02_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1