Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8be2fd437747ca6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-14 07:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 446c0479e0c894a1bf2a969d53cd6f05 SHA-1: 66eb842c53ef295f32a6d8a7a6fe0bd2c0f510bd SHA-256: e8be2fd437747ca62497f6a15f37f458f1cbe617b1ee6bb7f30214dc98eee64e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, indicating a link farm designed to obscure the true destination. No scripts were extracted, but the overall structure suggests a lure to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fablab808.com/nbloom/fckuploads/file/sonezabipetawiligegafaxi.pdf In PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/xipudasetalipoxa.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/93792657378.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/karipepipolobaj.pdfIn PDF document text
    • https://kermanrooz.com/img/files/pumiselubumosa.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/87618963139.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/pesozinekazoxipaviredim.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/39537129253.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8269e6f2---64088272475.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/65489907224.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/vanubosaxumuxutifepika.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/70230612167.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/87991311807.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/33869997688.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/11994279924.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/puluweparukixusezemuvexew.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/veralugegoxuruse.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/76679458911.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/28407723596.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/saruvazar.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdca9934f6---lubowok.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/kewamawitezukuxanomudut.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/kawetinujovevibobivapora.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/wadorepit.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vikenozunovozazokotibeluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+metal+slug+untuk+androidPDF 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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 15640 bytes
SHA-256: 5310dbc6bb58f7da32e5bc99ec5d44f475331f0b5279ea0179548e4e66fe19dd
font_02_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 10872 bytes
SHA-256: e67f7078ec95d432fa1881e733a287404fd575d4ffee003cdeae86931ed3f1eb