Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea5edb201ea23b3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 22:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9aff856400e4d271dce6c4c08d838344 SHA-1: a9bd3ed158dd2fd2e34327ba17c55583f5f220bf SHA-256: 3ea5edb201ea23b386979483a734230817a12f5b26cb7cab6dc59f9c8a4bbe63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The presence of external URIs and the overall structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://graviroz.hu/ckfinder/userfiles/files/35313333642.pdf In PDF document text
    • http://austria-ex.com/images/blog/file/49773676030.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210912_2BBD190171250AC2.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/96695471519.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jonawofijoxixi.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/negozu.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/64313775729.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/97932617410.pdfIn PDF document text
    • http://ipllaser.in/uploads/95603660444.pdfIn PDF document text
    • https://123natura.com/stockages/files/97423181818.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/lepupisudejusoxer.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/73926881618.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/81479782668.pdfIn PDF document text
    • http://placc.info/up_image/kategutajer.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/pogatenonuxibimazere.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/8919875168.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/konujesavilowawosanazuzul.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/c1aa2b64d158767b4d95b34236f5fd03.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/lovaru.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b92e6dd80---76085325649.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xitax.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631310215_4c6c11a20b.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/48186038227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mxq+pro+4k+s905x+firmware+sd+card+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_off0000c16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16D 18620 bytes
SHA-256: 811c60bab482cabd623bad19b6201199bef05731a68015a38623c00a1a19967f
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 11604 bytes
SHA-256: 1ee53e5fc1052f95c2efca10c358ef29f69504b4a03adbc7efc1a7a67db8d766
font_02_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1