Malicious PDF — malware analysis report

Static analysis result for SHA-256 351210a44aa5f3e8…

MALICIOUS

PDF

79.0 KB Created: 2021-10-16 07:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 46ac8d1d3bcb7469850c739f6db58061 SHA-1: 7f419fbcc57c86befe79ad8ea01fb92e7a059116 SHA-256: 351210a44aa5f3e8e5cc5997ee393002dbab5266d62ccb81ad699edb08928fc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to disposable domains and a link farm heuristic suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rancholasmonturaspremios.com/campannas/file/winilalitosagevexuzapo.pdf In PDF document text
    • http://gutachterbewertung.de/userfiles/file/646392296.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/desomebukitusotuwezorapav.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/86729954618.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/39297741257.pdfIn PDF document text
    • https://guijek.com/userfiles/file/sosafumabinulujij.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/modovegizevujusekova.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/wasimanuwubutuwuk.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/bedudapi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/cea62de13d8dc65edd4727ad17e13050/57806392707.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/pisubipepesi.pdfIn PDF document text
    • http://taociren.com/upload/file/210913225138164127bzbzr9jmc7pt.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/29705169537.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rezexibesanomifik.pdfIn PDF document text
    • http://itena.si/uporabnik/file/firowememutomodase.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/65877473410.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wepowiparonorubefam.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/40486379490.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/jagogefowuxasoxafixow.pdfIn PDF document text
    • https://vientangluc.com/upload/files/25257302343.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/mivotakoxaxojulolu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=bpo+phone+interview+questionsPDF 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_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 10592 bytes
SHA-256: 3d45ee07dd8cdb146396dfcafacb07a054d7bc954c4e388fe3c3315a89f631d5
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16384 bytes
SHA-256: 0e5aaf083ef43359e89a00f81aad4e9724777af5410af17138a9d7b7f2db1d73

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