Malicious PDF — malware analysis report

Static analysis result for SHA-256 802aae8399ceacff…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 03:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 396415ee2e7013714e5d8edc8e54ee45 SHA-1: d228c71bc97414929a2c391406e0bb9e0c403b62 SHA-256: 802aae8399ceacff42ebfb34746fb90ace288e860f696125673ae75998e75870
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains, likely intended to redirect users to malicious sites. The document body was unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ff4d7e1e---91385603122.pdf In PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/topizanakolasogegegi.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/93142880966.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/tevoruboruvaxupal.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/talikiruvilenavalod.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/85179454429.pdfIn PDF document text
    • http://topas.lt/userfiles/file/97759793165.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vavinakejiwit.pdfIn PDF document text
    • https://bachson.net/upload/file/4084825691.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-3/20210903142830565242.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/sagutamakij.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/92984514998.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/jamol.pdfIn PDF document text
    • https://theurbanthinktank.com/files/werojuguviwizusubi.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/82491785073.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/didixejutitegevulinejexu.pdfIn PDF document text
    • http://ty-int.com/files/files/83672320769.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/61335137467.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/susexalobi.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/piveziralidepevokuwowofu.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jamigebevet.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/vaxefede.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/mixokopasifavokozeposi.pdfIn PDF document text
    • https://nevisnews.com/userfiles/9252339822.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/linasuliki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mi+browser+latest+apkPDF 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_off0000c0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C5 10452 bytes
SHA-256: 55dfd9c4d82b127d4d3b8c467db15dc2f67d246ccab60ec406a29e666a286d53
font_01_sfnt_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 20536 bytes
SHA-256: 2826063e9dd32f47cb8eb7aefb3c21b0330c7031efc0f368135c6267fd98f685
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1