Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab74879474fe7d8d…

MALICIOUS

PDF

94.6 KB Created: 2021-09-20 06:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85814ad322d3f89320dc9fab27956d15 SHA-1: e5e1836713364cf8b147e90b3987df8f6190faa1 SHA-256: ab74879474fe7d8da5219db459e567ea02f9c25b52b551a42735427d6b925e4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure the true destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate a malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and heuristics strongly suggest the file is part of a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://proxus.nl/file/winatizabepum.pdf In PDF document text
    • http://otoozevran.com/resimler/files/mekemo.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/78243811549.pdfIn PDF document text
    • http://kd-council.com/upfile/files/20066967067.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/geroseranix.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/69632068154.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/wipadevulanu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pjbg2t5n5ffm6hue29ddg8gvm6/66261804657.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/4316648775.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/devoligabopav.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/nagipimofarokigugivojus.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210914_78D3ACF0874A736B.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/vaduruda.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/magusavivorirepas.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/27876830275.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/jatuzus.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/25167291727.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/dapeposevekazavenaxub.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/92261993358.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/rugume.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/parerafajenufejumad.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109072108516704.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/10209729004.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/fopitarojos.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/viselopasupupefotijuxeduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gta+v+real+life+apk+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_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 10604 bytes
SHA-256: d0d23be5c4e5bed0596375adf8516e42eb76479d2ead8bf7727923a345b61aa8
font_02_sfnt_off00013aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 19032 bytes
SHA-256: a46294e58e4d403082fd3a5804d62a50d6702961a7e513be72e88cbbc455a7f8