Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8e96eddd4fa8e8…

MALICIOUS

PDF

87.6 KB Created: 2021-10-09 06:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b36bea004356213f7ca343f0a17cb3ac SHA-1: 12160f530976d06959c29890fb679ae3d45110dc SHA-256: ee8e96eddd4fa8e8677b2ed15858abe8f62e3c09cfe7a2b489b1c8674ebb5fa6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

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://elosc.com/upFile/file///ITX202109071804142804.pdf In PDF document text
    • http://royalleasingny.com/admin/images/file/duwilovefizebokapuxuruna.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/vubikebelikatab.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/nujokomedofinokiwemel.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/3464961787.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/debudizafiwopafeneki.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/47474319554.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/69257677420.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914141852.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/71396719565.pdfIn PDF document text
    • https://seikai.jp/free_images/files/setawez.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/xawud.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/81878890773.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/57d0d44a5f1e3d4aec10ba5cda1d04d2/lolozebisubiba.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/69736337705.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615843f8a1400---89438175770.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/57524501511.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/12524264218.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/65859355748.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/72970606247.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20211007173228.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/84488287586.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/11782921271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+many+cards+do+you+deal+in+phase+tenPDF 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_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 19360 bytes
SHA-256: 7f1ded2dec61585bb0e32dd965395649d07b15be36c4700dcf889a1e659fd07f
font_01_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 11072 bytes
SHA-256: 76c939069a90e1e87af368d6abe46fc64e488c5eacbdbbee2ec373add5154533