Malicious PDF — malware analysis report

Static analysis result for SHA-256 a478ce1737f48b55…

MALICIOUS

PDF

78.2 KB Created: 2021-03-02 10:33:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1c38e9adc5258cc3da435e60f63eb05e SHA-1: f7982c5a69fcc1b1ceef8aa503025bcae4a0b8b8 SHA-256: a478ce1737f48b55cef0796f6d17693149871341b2b075c0b0200c8e2702c937
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user engagement with potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=the+best+love+quotes+ever+written PDF link annotation
    • https://cdn.sqhk.co/xolanikipiz/EYvgfgg/35483777758.pdfIn PDF document text
    • http://newser.site/hnefatafl_game_piecesxyr3g.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/novewipogam.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/voyyhiW/27435646962.pdfIn PDF document text
    • http://shopsmmv.site/jungle_adventure_game_download_javagtema.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/bhgjahc/60011666329.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/ygihcja/75523987865.pdfIn PDF document text
    • http://webcam-model.online/758162683548jr5x.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/Mzxicjb/limufureju.pdfIn PDF document text
    • http://apeech.ru/voxovelerafexupotiq2xy.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/87579510100.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/83177943450f6w3e.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/eT3iihW/the_walking_dead_dead_yourself_mod_apk_obb.pdfIn PDF document text
    • http://fitokapss.xyz/54580934739m70cy.pdfIn PDF document text
    • http://help-ruleviolation.com/ferris_buellers_day_off_imdblqcou.pdfIn PDF document text
    • http://ru-en.xyz/80665084048fp8yx.pdfIn PDF document text
    • http://vpntop.info/mufifigojubudusimunigi97svz.pdfIn PDF document text
    • http://ductsunlimitedins.com/household_expense_spreadsheetillqp.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/egjt5gc/knives_for_sale_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 4812 bytes
SHA-256: 7e13ef04be0d87b345941f6a57ab385473009db25d45da14b62e8b2c3b1e365e
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10888 bytes
SHA-256: 89bdfffd930be28468c41aa9e4a3328e513eb85df88ea09c79a3cc52b559e723
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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