Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f85a547565e4c48…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 03:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29dcf8c18c356cb3ea565c93b1da64ab SHA-1: 657577200afa70d59567987275f18de871137f95 SHA-256: 7f85a547565e4c48ab65dfd197c2191e5ac3284ab39b1ce05840251fb1519f1e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains or redirectors. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://infrive.ru/uplcv?utm_term=spongebob+game+frenzy+apk+mod PDF link annotation
    • http://peterpan1996.it/userfiles/files/41506866990.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/xosisobubaxovumidejawe.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/36685057662.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/sawogenewadi.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/ludezisulaviwevufidalesof.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613718ed2ad63---welakifujizasamorifid.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/ladobinoputevevep.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/70081618556.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/denidaxidavasa.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/dobapasoteravexo.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/bikagemaramur.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zogelojulu.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/88641944841.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/80468329954.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/94412716036.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/4307591587.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/25906773443.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16137457cd7599---1392034367.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/53348732702.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219116742740.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/53962338512.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/42168433476.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/semikopujadosizubo.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/pegeku.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/luvizedurubonolelumetujaj.pdfIn PDF document text
    • https://pixel.bg/img/file/telajitefofuvawid.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/23608397101.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_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 20380 bytes
SHA-256: 01f77dea4b858557401b2c69e4327b58e387989ab1eee53edcc3880ea6613941
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10916 bytes
SHA-256: 198b48c7d80fb0aad49bfb9d48c5574bcb1895712853e1002303c71cf3282f12