Malicious PDF — malware analysis report

Static analysis result for SHA-256 753d33a18a1bcbe5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 23:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb5769d2027f924b80200b63759ddbeb SHA-1: 3ef7a98d085a4e3e61162638d600445a1afc122d SHA-256: 753d33a18a1bcbe54d6c536925d380d3baf3c5a8b56b5b409c83315ab99e3bfa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also functions as a link farm, with numerous external URIs pointing to potentially malicious content, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://bud-med.eu/userfiles/file/26084762902.pdf In PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/11406056055.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/56799109753.pdfIn PDF document text
    • http://dgjst.com/upfile/file/buvirifa.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/dogewobigirevepawiwug.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/50262938473.pdfIn PDF document text
    • http://orlickachata.cz/files/files/48516642479.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/58505005057.pdfIn PDF document text
    • https://csodamalom.hu/files/files/vunatajakilomowapas.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/27393410065.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/23073120530.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/33622084944.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/39681064174.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/tosesobazuj.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/16335184455.pdfIn PDF document text
    • http://sissonne.hu/editor_up/95455111034.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/39149842601.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/nilikewamorelimamiris.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/4716268631.pdfIn PDF document text
    • http://deforma.it/userfiles/files/taleselod.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/98005537430.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/4397447379.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/domuvefejigudofix.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/zeluravifotelanik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=battle+warship+naval+empire+mod+apk+downloadPDF 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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 18728 bytes
SHA-256: 79cd414e34972b18569590828ad3542bd7c8d065cb5e216aa6f9d5b1bdc6f2cc
font_01_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 10952 bytes
SHA-256: e5a428605dbd7054ffc4bf878e2822ec642b9b9f5842be09f0e1de7ac0a8ab3c

Open this report in the interactive analyzer, or submit your own file for analysis.