Malicious PDF — malware analysis report

Static analysis result for SHA-256 67acfff0a82410c2…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 05:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a939a801601e8218f1a14e443adcec5 SHA-1: dcd47568700c602bcf2d2fca65ceff450ff5dcba SHA-256: 67acfff0a82410c2b4354f777601c72e5a1a8647225428804ee72e824a0cb500
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDF files, some of which are algorithmically generated and hosted on disposable domains. The presence of a 'download button' heuristic further suggests a malicious workflow aimed at tricking the user into downloading a payload. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cityfate.com/files/files/sejemalixinirawip.pdf In PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/radomajipexonubifaf.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/72118792646.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/nevuzamisazidaratolo.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/84823551196.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132e66eafddb---nowefasil.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/23944910180.pdfIn PDF document text
    • http://lawngo.net/fckfiles/pivekilid.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/xozoletidajuned.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/91841684834.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/4521862968.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/sodawasasuduwusakupije.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/pezixukutiline.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210905_A57507846931108F.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/51179956076.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109021433519965.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a97d21df---zuwejojovuronijajufigiv.pdfIn PDF document text
    • http://synhbio.com/upload/files/ripofelasiloderur.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/dadote.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/wenolofevati.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/pasuxubedujomazitusupexuw.pdfIn PDF document text
    • http://domainecomps.com/documents/files/70824505954.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/98387244621.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/zisakuwasabezofotuwa.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/1035068636.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/92390915547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=discrete+mathematics+and+its+applications+8th+solution+pdfPDF 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_off0000c71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16952 bytes
SHA-256: 1115544f075c0f6a8b747f790ecbfecfff9fee6b474b5f6ec9a84d8e48c98600
font_02_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 11196 bytes
SHA-256: 543671565b40351533e7b4437ecf3bf983d72f0862aa72a5f3def5105be2eaff

Open this report in the interactive analyzer, or submit your own file for analysis.