Malicious PDF — malware analysis report

Static analysis result for SHA-256 927bc8079726f72a…

MALICIOUS

PDF

77.8 KB Created: 2021-01-18 18:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 86070cd06bfb5592d071a618bd5772c3 SHA-1: 7338ef8104ca5cb0f4210ca629b34dcde468b0f6 SHA-256: 927bc8079726f72aacd38c72c510773725591f5d9e5907696b2122fca3a09fa6
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to 'druttle.ru', suggesting it's designed to redirect users to potentially harmful websites. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong intent to lead users to external, untrusted resources.

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://druttle.ru/aws?utm_term=sp+flash+tool+s_brom__da_fail+0x7d4 PDF link annotation
    • https://site-1178548.mozfiles.com/files/1178548/filejojadomesanivit.pdfIn PDF document text
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/6058261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5ffa916705c75.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/hdghjjo/online_group_video_call_apps.pdfIn PDF document text
    • https://site-1257691.mozfiles.com/files/1257691/nespresso_vertuo_breville_manual.pdfIn PDF document text
    • https://site-1177042.mozfiles.com/files/1177042/space_wallpaper_4k_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/iahZid7/game_dev_story_best_combos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_5faa06ec8d9c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f8d3ef5eb80f.pdfIn PDF document text
    • https://paxowamowutujaf.weebly.com/uploads/1/3/4/3/134322095/wonupogen.pdfIn PDF document text
    • https://site-1171133.mozfiles.com/files/1171133/baseball_9_apk_latest_version.pdfIn PDF document text
    • https://site-1175908.mozfiles.com/files/1175908/25773582897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376629/normal_5fcf86088661a.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/jijvgbH/nudawilubilidomog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dumizalu.epizy.com/66650439867.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 5932 bytes
SHA-256: 5d0d2876dc7767a38a5fc1053d416c9f04f9c117bf7c12ef80d2507688a7efd8
font_01_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 10468 bytes
SHA-256: 2745937a04d11e060659e27708371be5f2b813c7bad7a8f05f4bb65a4bf6a4b0

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