Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2e6ed43d2ce5ed…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 19:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a118187a70b0035c73b05d415bc25d76 SHA-1: 29aa03f7e5e736ea8171f922552a0186f0769de1 SHA-256: ea2e6ed43d2ce5ed6db2f8e4fb881a52facbb8a72cc045a7cc4e11c8cf5a6c42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially malicious sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://familiehollander.nl/images/uploadedimages/file/42162330701.pdf In PDF document text
    • http://tythb.cn/uploadfile/files/jovut.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rlup729niah184sa1jqkui2pu1/77008457849.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/8791099621.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/tuzon.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/jewutivabozuzofulu.pdfIn PDF document text
    • http://school15-tyumen.ru/f/dugezelewepexidedutazuz.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/72597786571.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/17680821687.pdfIn PDF document text
    • https://stotex.rs/files/72140136245.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210923061012.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/72376695540.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/lekibi.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/duvuxumijebupaba.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210901184558.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/nabadibuwupozemafibut.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/riduvikozenuluvero.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/81662460382.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b748b6ac60---79764616047.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/41303698324.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/10696723679.pdfIn PDF document text
    • https://earthchallenge.be/sites/default/imageuser/file/48320248557.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/12934562208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=saturday+august+15thPDF 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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 15612 bytes
SHA-256: 1c1ff152a000ecb1398ba8954c93d084e79fb48623da60c374493e9f5fce921a
font_01_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10508 bytes
SHA-256: 35b3a4b39d73fbd3b556a8d716faebc89d6cfcc9ba9f73ba20c6e1b72f8d7912
font_02_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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