Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7eca8ee4a6f5cd5…

MALICIOUS

PDF

77.1 KB Created: 2021-09-22 11:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 880703cea285cbe42b80e70e7228fc69 SHA-1: f409d0854e3feec04ee87801e12c7f963c84e03e SHA-256: f7eca8ee4a6f5cd5b4e0ac957b0c64955fce2887024d1d0c58042e083b04f1cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://i-daa-wl.de/userfiles/72262941113.pdf In PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/58823044148.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/55818589139.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/53440560699.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/90856680268.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a54d0e9c3---logezes.pdfIn PDF document text
    • https://stotex.rs/files/67674593277.pdfIn PDF document text
    • http://www.agot.pl/upload/file/nonotojojeg.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/mekojuzuwovilodiravufam.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/xamigoferunaxibop.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/25142013021.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/vibewijurakoraruwudo.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xomuvizapemuxoxuwuvareb.pdfIn PDF document text
    • http://travellerisland.com/files/jogofobomedawopegakiru.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/48773043000.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/tapilupobif.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/893b45ea6bb1044c4242f0440e7601c4/3870569384.pdfIn PDF document text
    • http://paradoxine.com/upload/files/45292270075.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/nebejifetupirarazisa.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/tujojogaborase.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/84294332132.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/24160981499.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/22635388657.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/nijalexegoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=paulo+coelho+books+pdf+downloadPDF 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_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 10848 bytes
SHA-256: 7ce47cfdcfdb27a80e14b0ea7bfb4e4172e77b95d50fa7b009000d38d1ac4f7e
font_02_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 18344 bytes
SHA-256: 4ab06d3a0435f7b5c309cb90d7b00dc098608c178aab26c0748d8270dbb16adc