Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf0a1d3507fd58b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 14:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d35eb26002426f8f55ac3e35c5d9ef8 SHA-1: a879f69b1b2bee53fd088f6c3642d57d4ba4e736 SHA-256: eaf0a1d3507fd58b6efef744f25f2a785758f807089ed54e41bdeb68ba7aca7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/milivodovowizepadipiv.pdf In PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gaxid.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/69275802301.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/18428545720.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/56438187551.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/nirurituxixoxibewej.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/pizometifusevelojug.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/55204154967.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/21305115743.pdfIn PDF document text
    • https://tomas-music.com/contents/files/tikegopukojidi.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/38968774128.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d45e1d76d---vazexavebuxafuge.pdfIn PDF document text
    • http://inistor.com/ufiles/files/22179391303.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/rerunajopasagidog.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/vujuritufutupapivakirijuv.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/jinumavufedimusujujiduta.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/jebagaj.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/nenasobesolatawiwibes.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/66093200409.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/xarapegejagugimanan.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/lufogokariva.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kovofosusutabiraroragosap.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/wozagozigogatimozaninolog.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/18803865231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=epay+android+app+v2PDF 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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 20000 bytes
SHA-256: 8ca614d17494e1165ac77c88484d48c3e1f5cc405f3ba1db250de86829e3d1e8
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 10224 bytes
SHA-256: 115e5963f82d3d62919e40d1baafecb0554567f0e85b2c53aff02a58c3141e8c
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1