Malicious PDF — malware analysis report

Static analysis result for SHA-256 417784a535a13c34…

MALICIOUS

PDF

73.5 KB Created: 2021-02-14 08:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ca3d493c25e32c65fa6d2a5fa389e95b SHA-1: 3b51d0b9ae8a7c43ca0ebf77928f396f82a495a7 SHA-256: 417784a535a13c347914d2c3dce3936920cf260afcfa41cdc573193c8e457c19
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to 'baarspo.ru', suggesting an attempt to redirect the user to a potentially malicious site. The document body, though heavily obfuscated, contains references to 'Severance middle school' and 'wkhtmltopdf', indicating a lure designed to appear legitimate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://baarspo.ru/123?utm_term=severance+middle+school PDF link annotation
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/cc068b76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_60130596592e6.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/bozemixokev-pebavu-visegupivu-jubufipinizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467325/normal_5fe5540826e21.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/vidaxifudaped.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/ddac770a532.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/DF1Hvid/64899261742.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/jiAjfjh/rojivaruja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/hungry_shark_mod_apk_android_oyun_club.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/website_design_examples_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/best_3d_wallpaper_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/bluestacks_android_emulator_for_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/business_case_format_sample.pdfIn PDF document text
    • http://saxowuwu.rf.gd/mobile_call_history_tracker_free.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/vamoninumep.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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 5340 bytes
SHA-256: c00409bc19e58a7655351bdc52bd297133f8af1a0019d3f27f07215057a4eed0
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 10524 bytes
SHA-256: b529cade5c213d8b5e131d1fe9072c60ae58aa698361368181cb02b3298aa329

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