Malicious PDF — malware analysis report

Static analysis result for SHA-256 53eec5b0dee4e0f4…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 03:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0330fdaf3d1f5d846c7c28a6c8bc3b85 SHA-1: 98e9fd610b60e4005f7b9f16a05eb1375ac0b242 SHA-256: 53eec5b0dee4e0f4bc11cebae5c9aab47f484e4cf5fa6732885ac3f6d7c15082
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hermanosvalerorecio.com/ckfinder/userfiles/files/zurifodelobavotidoxajifu.pdf In PDF document text
    • https://aimhc.com/userfiles/file/49111487365.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/lagezetajufuvolavevete.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/nanuze.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/linojaniluroxajigusi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7588d1c2837b7c14ab8f19aa5235586a/22244099485.pdfIn PDF document text
    • http://www.polni.si/Images/files/vibudedim.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/91241034044.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/95298011894.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/6986180685.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/wejukuzazafiwopepemaro.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/98877923819.pdfIn PDF document text
    • http://salkim.com/userfiles/file/kuzekimefaxowaxo.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/mugoxipa.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/59196876157.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/50664988090.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/97618415144.pdfIn PDF document text
    • http://abwva.com/uploads/files/15965256640.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c6d3b6681---fesured.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/lavejuwe.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/risatar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=coin+master+hack+cardsPDF 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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 10712 bytes
SHA-256: 35a3bdc309008c67b05e98d37ab491828de584c805bc6f84fb6175d05a09eed5
font_01_sfnt_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 18184 bytes
SHA-256: 66c8b2532d0a8e771d3f211bfab0fcdf477f762a0199843e3ff9fc1a1f05c2cd
font_02_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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