Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b702ec01237024…

MALICIOUS

PDF

113.1 KB Created: 2021-09-16 21:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 522039b74f0329b4c8d6dfa0beef257a SHA-1: db5ee94789fd0b54c1a9ceecc9bd3eda791f49f4 SHA-256: 57b702ec012370246e1cec06176b8b2de87f2894c8b3e3afba85ba23efaa3839
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension, a common social-engineering tactic. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download and execute a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161402a2ed786d---ximijogixuwup.pdf In PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/47006415111.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/1515205327.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/rejizabumij.pdfIn PDF document text
    • http://vucert.vn/uploads/files/95404547981.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/tozujadup.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/nofugi.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/nijazajanerebumuv.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/mebigexat.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q84qc2ch7e4c1rrl4k6hpelcte/5026393981.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/simifasore.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/roruxez.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/96643914237.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/29095350732.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lopebo.pdfIn PDF document text
    • http://gibisch.org/files/files/57557520686.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/5649639991.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/likudexoxiwonelopiximus.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/8363720663.pdfIn PDF document text
    • https://buka.ru/sadm_files/putegafa.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nabefupamor.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/40257975943.pdfIn PDF document text
    • https://dcimx.com/files/36686214837.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/guruloloburigirojevuje.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/25112522711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=update+windows+8.1+to+10+freePDF 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_off00015645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15645 10984 bytes
SHA-256: 434898dac5c1ef503199867fdbcb9f3e1317f5b621ba261b0fa625c597b154ff
font_01_sfnt_off00017007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18819 18156 bytes
SHA-256: f728922f3bb21f6a11c7a5630a2139358f782ef6c1985442a40429e68cc2c37a