Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad900b2be592b133…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 03:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8205e98590edd9ba20b9f5cbb54805d SHA-1: d0637d4c4ee1d85d9e60d17be66529087f62ef1c SHA-256: ad900b2be592b1334f79990d520ff3e5092c849db1bb13e724a2420679cdbc05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to external sites, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to distribute links across many disposable domains. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/wemizesafozelu.pdf In PDF document text
    • http://naturestuff.nl/siteimages/file/zajekofulon.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/repinu.pdfIn PDF document text
    • https://ratoempat.com/contents/files/nirewamujuz.pdfIn PDF document text
    • https://norservis.com/files/files/xarugufidupes.pdfIn PDF document text
    • http://akademibt.com/resimler/files/giwategixizideve.pdfIn PDF document text
    • https://tele-video.ru/upload/files/55512412434.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/jelitogilojifuxinef.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/4614128108.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/70715288152.pdfIn PDF document text
    • http://393citizen.com/upload/files/27649601479.pdfIn PDF document text
    • http://www.grifin.sk/files/92135125378.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/matoxezesisuvabegarirefij.pdfIn PDF document text
    • http://htwy.com/upload/file/31469330786.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/moruxogimutilaw.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/57588054374.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210910091420.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090404303773499.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/3831452755.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/74607706788.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161346020d0c80---jipuxadeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=onmicrosoft+365+loginPDF 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_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 17872 bytes
SHA-256: 3515f711109874e96776454084e18ef2eafa34face596df541d703fe26002799
font_02_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 10884 bytes
SHA-256: 95e05a9dee64be7b64794b4f308ec4b872459cc4eb62fec906376c721567ad88

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