Malicious PDF — malware analysis report

Static analysis result for SHA-256 83076333df97c155…

MALICIOUS

PDF

71.9 KB Created: 2021-02-16 22:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac42494a7bebe8b4e03eb0fc39aebd8b SHA-1: cebdbc7fedb6116cd89bc8ef868c94b0ad303208 SHA-256: 83076333df97c15503456c1a27f4b1e490401f077b3a5ff8958014f88e2c3146
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Fender mustang i 20w' and 'wkhtmltopdf', which may be part of a lure or obfuscation technique.

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://leonvi.ru/123?utm_term=fender+mustang+i+20w PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5ff0100314e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_5fd7103505add.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/jaihhch/how_to_learn_html_coding_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/UhGpih7/3119810894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502819/normal_5febff12e9013.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/7yOge5Y/luvineradafekov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375704/normal_60086faf6e079.pdfIn PDF document text
    • https://cdn.sqhk.co/kixepijap/ESid6he/tiktok_followers_booster_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/sgheGhf/fuxewemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5ff365ac80a57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fccabf58a259.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://bibuxidon.rf.gd/jkbose_date_sheet_10th_private_kashmir_division.pdfIn PDF document text
    • http://dizojid.rf.gd/navifawezipibuf.pdfIn PDF document text
    • http://xogofilobapup.rf.gd/ultraviewer_32_bit.pdfIn PDF document text
    • http://tamazodatitemi.epizy.com/29796148225.pdfIn PDF document text
    • http://zoxutuperovizo.epizy.com/word_document_business_process_template.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 5204 bytes
SHA-256: f6af3c6266ead47cc74d45c772db0f9d0c84ab26cc5b05fa9621dae289e3a6a6
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 10252 bytes
SHA-256: cb4bf0c25bd690deb3a8ed73e951bbb1fe4b92d23f72f549cbba85f84bde75cc
font_02_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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