Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b7ac39cf39c414…

MALICIOUS

PDF

84.6 KB Created: 2021-10-10 20:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 102439215c928d0eb75f333500292035 SHA-1: 47da07f45c9bb4a4a0386692406301b3ac91019a SHA-256: a5b7ac39cf39c4143a799b532083d578b0f55b17c43b10a947990b53a00e0a52
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for malicious PDFs to execute code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tranduongauto.com/app/webroot/files/images/pages/files/78713721932.pdf In PDF document text
    • https://faresaldabbous.com/uploads/file/nigutaxalilun.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/newimopenugebusebone.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61417225570.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/somipadexunepirofum.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/soxosol.pdfIn PDF document text
    • http://pvvc.cz/files/72670916880.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/rokumaxifibiwanusemufe.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/80500032737.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/65743646345.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134231a968be---kumomanebevalibipaxokuk.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/pamigefinowapovojiga.pdfIn PDF document text
    • https://penzion-palice.cz/content/roguvabokapafizafafo.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/navaworiju.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/97993009100.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/pupunuwowolumotujatex.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/febawifasiziv.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/kulizot.pdfIn PDF document text
    • http://splogservice.ru/content/file/rifiwo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5a4ac449ad7d6792ec840043a3d83b52/jadebujadoxidefotit.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/ruxarivogezoteve.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57313419334.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/76041110398.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/60810761437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=advertising+during+a+recessionPDF 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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 10648 bytes
SHA-256: 6e9cdb101743c6396f83500354e87f388ebe085078b0453c66eb023a256ed6a1
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 19412 bytes
SHA-256: fea524cc1ec7fc38a36c1a36de86569f91170fcf9c774635e438ef9ad9d70d9f