Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86b004f1f39f365…

MALICIOUS

PDF

80.4 KB Created: 2021-02-26 16:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e8f1c726c95ee686bba8e61c0832ad0c SHA-1: ff0d6f6a3ffe847e161880d32445074099881548 SHA-256: f86b004f1f39f36565c4ad3994ca83ac298092395c5894b39bf9563454ba1a3c
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 embedded URLs, with one heuristic identifying it as a link farm hosted on disposable domains. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest a phishing or malicious redirection attempt.

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://golowaki.ru/wb?keyword=what%20replaced%20the%20m65%20field%20jacket PDF link annotation
    • http://figuzunifowet.iblogger.org/41887504141.pdfIn PDF document text
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/c157e577df4.pdfIn PDF document text
    • http://punevufazeji.iblogger.org/3rd_grade_math_worksheets_division_with_remainders.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/rudimeju-dakonadev.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/modobotat-podafikalisu-busuxib.pdfIn PDF document text
    • https://sulagumafiwez.weebly.com/uploads/1/3/1/3/131383207/rixexonukob.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/zLxjfgf/weekend_deals_at_lidl_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/fhiMhcp/jizagupijemiwux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugumew.epizy.com/apache_ignite_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/fokupetipasififorawumuli.pdfIn PDF document text
    • http://satonavuka.rf.gd/update_android_sdk_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/aadhar_card_without_enrollment_number.pdfIn PDF document text
    • http://zisufabelez.epizy.com/10765508214.pdfIn PDF document text
    • http://wilixafex.epizy.com/blue_jazz_piano_sheet.pdfIn PDF document text
    • http://dakokaxawizepu.epizy.com/31325318168.pdfIn PDF document text
    • http://liraderivuw.epizy.com/new_city_catechism_question_11.pdfIn PDF document text
    • http://zojomesadenatid.rf.gd/bosonufifikinijubade.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_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 5648 bytes
SHA-256: 33b2a07f781ff48980a2f91007e884ca21a9e3e9c2017c966d505f761fb696fb
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 10728 bytes
SHA-256: e3622550c50b967fda2e0de0193ba07f4d5cc2b8cdd7db59ce67ab4cd0a32764

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