Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac75d4624e2cd788…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 00:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9921a35db0f94b361af8b23e2724d18e SHA-1: 1cd161bce3cb13b28d7432dac0799ed952864938 SHA-256: ac75d4624e2cd788e6b474272fb63ad30d2fae91e430f66359582730e27036e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it is designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://coretry.ru/uplcv?utm_term=bus+driving+games+for+android PDF link annotation
    • http://caytrong.vn/Images_upload/files/32656813755.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/zojofemevavuxelar.pdfIn PDF document text
    • https://rais.bg/uploads/file/18630915977.pdfIn PDF document text
    • http://le383.com/uploads/files/27102408631.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/95433810441.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/61933545143.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuzumipavozupojoludusizob.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/59739158898.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/75088674427.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/gimaviwen.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/dutaxapikafiz.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/rixobepaki.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7677d483---93667155726.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/11766901725.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/59224228681.pdfIn PDF document text
    • http://topflexsports.com/uploads/fugizezukare.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/bapavokaxekopipiwirade.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/22345439968.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613485481b553---dajojik.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/wapinufapakajuzomutinow.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/bodovafomimebamegitove.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/kaferos.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/87997471805.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/xogigederurogomomolera.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109132051233025.pdfIn PDF document text
    • http://orenprom.com/img/account/file/tenazikifoderan.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_off0000ba93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA93 10772 bytes
SHA-256: 3e053091b7646e209b27f4af1237aa4229c5ba3789b5d96fae38fa565365e7c9
font_01_sfnt_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 16980 bytes
SHA-256: aff7f7ca7ee2db669c4d5281014a241b441cd680a22aa953c71c8d0f002b0649