Malicious PDF — malware analysis report

Static analysis result for SHA-256 642214d56e98683f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 03:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6c2bcc2f2faacbb2678907b3c5b8943e SHA-1: 9892062c9dd732443224cd574ee67ce350463d44 SHA-256: 642214d56e98683ff6a835ca9992b814b19ff3c2daa22fcd4317657d0b8341c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to external PDF files. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://aptekadc.pl/userfiles/userfile/20008910872.pdf In PDF document text
    • http://smm-mm.com/uploads/news_file/rareworasebufulilofikuwas.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/tamesowag.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/84350685410.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/fetedesipusu.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/ritaxej.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/50741712946.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/39508947072.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/41626486090.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f552e56de---92189187293.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/divefetifomularuniludesi.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/bekimategudazuduruwuje.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/wotitivemuxos.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/fomurusasurokutadaruvu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0483749001631535832.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/suvixifovogusa.pdfIn PDF document text
    • https://citronel.com/userfiles/files/fuvapilikaz.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/tuxotu.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nasozigo.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/57918613345.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/19000021733.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/luvodagasuvig.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/38536464611.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/41183433114.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/bigokaganada.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/24949305273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=animals+found+in+tropical+rainforest+biomePDF 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_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 11000 bytes
SHA-256: 6e1f96ce185f85eb530594e4437659a3f7df8c42252112dd9d795dc247a3a0a1
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 17800 bytes
SHA-256: b450d0b95928bdd873c513e9f73151fea3ed6339fe3055571e75920459a15877
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1