Malicious PDF — malware analysis report

Static analysis result for SHA-256 c884df476526f287…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 12:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f31d555a8dd45b45ab55d07a6d541677 SHA-1: 3cd23c9afb0e983ccb6872728c7408e217fcd37b SHA-256: c884df476526f287b16a33f4314bc6e18623399a12d9b8b76a12142bb59b00a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document 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 external URIs pointing to disposable hosting and employing a 'download button' lure. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=100gb+free+storage+apk PDF link annotation
    • http://soleilboo.com/images/uploads/files/34536560794.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/pojavipowazomimas.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/9631208986.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/5270341511.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/91911581502.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/59496002215.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/67825995531.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/10909186165.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/bujomubeviselusojowuziter.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/46975260227.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/monokikerizekananepusoru.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/vapimikevuju.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/20989286610.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/20856846634.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/takitu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/bobobu.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/maboxir.pdfIn PDF document text
    • https://bselink.com/userfiles/file/toserorajumeb.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/fitotukazusokedozig.pdfIn PDF document text
    • https://attack.lt/images/files/39698546100.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/jinusibetosozavorumu.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/suxixokedakimoranutek.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/46952744028.pdfIn PDF document text
    • 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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 10600 bytes
SHA-256: 5942e242fb6009c0d2baa3044fd985bf168d183c61b19f8f445939764cf086bb
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 18576 bytes
SHA-256: 444ebe22ee565bba23f501525ce3b6c3a9367907f1dc500563be8b99b4379083
font_02_sfnt_off000135ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.