Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aa639b5aed4a98…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 22:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be3f4b888c7c865af2c16a47467d6f3a SHA-1: 37a15b701270929772080cbe5aa4126145143763 SHA-256: d6aa639b5aed4a984ccb05fa9bf8aa67e1c793e9585e8dd07e6a81f418b8cc60
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340824a50cb---vuzakugebip.pdf In PDF document text
    • http://mycoapaisyl.com/webimages/files/dukiwajagivuzubuzadux.pdfIn PDF document text
    • https://aitalk.vn/upload/files/61705197483.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426e3520c1f---57778092094.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/5104293056.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/maganozafavax.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210909_2D3F3DB9ADBC038E.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/52193223101.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/19068494787.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/tupebotesururemipex.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/voxinenuj.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/kumajanoxakuto.pdfIn PDF document text
    • http://giga.sk/storage/file/9535956203.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/vowutezaferibivul.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/79621559386.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/15705136511.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/joxebikiderobilisapexejud.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/tulibufelavekuvu.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/46983720203.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/61510825239.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/vorelobo.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/kiperazunuvugonenimexuzar.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/vavagosiroxebenujixogez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=katmoviehd+latest+bollywood+moviesPDF 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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 10704 bytes
SHA-256: 7d5ece0e8f4b83db38181d17488f5a11e4c69a9f1f0e45da912bd5b72f12376d
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 17308 bytes
SHA-256: 2287b0e5e1ed805913af6dd9026546f03bfa648955ffa63396cd89cd5c993643