Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6769da0126e58ad…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 00:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2efaf4d2acd1858dd1c29bc6b0a8e1e SHA-1: f777d7f060100187621abce9da2c06030c60f257 SHA-256: a6769da0126e58ada6bd6723b4dbb76600f61a3bd21422a7921381b65a2e3803
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings and numerous embedded URLs suggest a phishing or malware distribution campaign, where users are directed to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm strategy, likely to obscure the true malicious destination.

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://ketchas.ru/uplcv?utm_term=nba+arcade+edition+apk PDF link annotation
    • http://szcftz.com/upload/pojojiborijalonudigov.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210912215342.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/19466542280.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/57692605567.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/banevuvefen.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/duwudirexakijabuporovo.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/47471578253.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/xagonemonozosimuvenin.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/gibowigegodanotamonamape.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/ninofidi.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/zivafixedomebugututawiv.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142d1eb06749---75734204009.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16148341a86ad8---23223847299.pdfIn PDF document text
    • http://apcmagon.com/userfiles/vuxoxide.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/pejorem.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210903195408611707.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/gogivize.pdfIn PDF document text
    • https://defi128.com/userfiles/files/jurokifomabebufate.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/57915211613.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/25539608540.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/jalovafilovodimexinowupit.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sbj02osp04ngsus3i4k3lurl1c/genetetiru.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/17440493710.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210919_279EA18137135B3D.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/96633813838.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_off0000bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 17308 bytes
SHA-256: e83473fcee3eef993e160fe713ce04709fac2df7ab197fbe753bf3415b4c9801
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 10500 bytes
SHA-256: 841e8a3cb38deb47ef45e7675558b1ab6dbd63cc6e62a0a921f665dad4073e87