Malicious PDF — malware analysis report

Static analysis result for SHA-256 694437679f11f997…

MALICIOUS

PDF

89.8 KB Created: 2021-09-19 14:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cc2b80b80be442939ef8a045c08851f SHA-1: 545a8f6872e6ce80d533cedee1515de9ec546939 SHA-256: 694437679f11f997e251cea5c57fcbcf513a2c0cbd5fd9d0b273d38edf098598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://philabc.ru/uplcv?utm_term=magisk+manager+latest+apk PDF link annotation
    • http://ephtour.com/FileData/ckfinder/files/20210905_DF5CE1EA83565006.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/delavone.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/zazilesewovovipidoxas.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/21437764712.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/23846464253.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sonivitepavepodezitip.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/loreruwa.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/fudobomekikujigufafexit.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/gegit.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/pikipud.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/famelol.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/xugatoxopozegejidukuxi.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/5442588946.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/31737829644.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/84927827715.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/10649234717.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/sesuluwuroboxobarikode.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/54603020908.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/343095360.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/ziredesigus.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/94535229355.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614017e3c6788---xomaxeledinidot.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e84799b0---15105563186.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/61308486558.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/dipesabutujewabutewo.pdfIn PDF document text
    • http://asvpp.fr/pdf/rewakewakowuva.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_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10560 bytes
SHA-256: 0a4c2504fe304bace0e783ec644490873e8a2811a24951e704bc806af6932598
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 18900 bytes
SHA-256: 50bfa393ec63e16b6f2eab3ad94d7e49b734b314f8e7b8deda65d1e008dc1107