Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb1d2e5a35037b4…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 11:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e025bfdadda0b4593ac4ce5457a44cdc SHA-1: c253f40e64cb78a34e775721a09b036b7c4045ac SHA-256: ddb1d2e5a35037b4b8e80ce14a2b011e030c4fb7883b280dfdff8ce3b763aec7
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 disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=custom+rom+galaxy+note+5 PDF link annotation
    • http://bloomx.com/sites/all/sites/bloomx.com/files/nomuwud.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/kikuvuzodiraluvigurokufo.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/73306927219.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/21031432769.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/funaxisijas.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/zidesadem.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xewatawuziwabopomos.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/83536150376.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/tumabapa.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/juwepekenizi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/647ccd635c39454a942ee6707ef4cc76/76519388360.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/nizibidibinixafelevufe.pdfIn PDF document text
    • http://wirheiraten.de/images/file/10145121803.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/62512021315.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_822BC1D6A7F27835.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/69180456183.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zadisufekaxalukezobipe.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/77156238950.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/totezijekevose.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/serixufamexewexuvikujabig.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/46594296380.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/68896813033.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/75076253535.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613758dc2a41b---jibulobokebimotem.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/66809097286.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/katurowe.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_off0000ce9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 17488 bytes
SHA-256: 2e826610e17fe0693f3c3868216c35e2816419b819dd1ab0d0ff4b96c6aee16c
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 10840 bytes
SHA-256: 4f24238d76346d5f3cc1b4ed10e936e4ace6463a1fdb2f93120c3a4f19e06981