Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3bc8d994f0dc87…

MALICIOUS

PDF

79.8 KB Created: 2021-04-13 18:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9bf9df6cc8300143ed50f0f7d7609da9 SHA-1: 211ae303378af6e7c503a79a26c1b708cb70f7cb SHA-256: 1e3bc8d994f0dc876bfd4a9447a5696cb2cc442330c241efc207812521112be2
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, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain search query text, indicating a lure to disguise the malicious intent.

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://mezovuduw.ru/strik?utm_term=what+size+belt+do+i+need+for+my+craftsman+riding+mower PDF link annotation
    • https://cdn.sqhk.co/zadoweferoxe/XSjZKgc/jukesovijebezefuxuvomu.pdfIn PDF document text
    • http://jumpfs.space/biografia_de_geronimo_de_aguilarm8mz4.pdfIn PDF document text
    • http://cashfree.store/what_is_95_theses_meanv5d1q.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/f8jbCig/map_markers_minecraft_bedrock.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/agghdhj/doluzowoxelon.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/vnsgu_bcom_books_gujarati.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/ib7Lkry/juzudenona.pdfIn PDF document text
    • http://firstflirts.site/rumamadedefinza7r.pdfIn PDF document text
    • http://idealsit.fun/74346215048433gl.pdfIn PDF document text
    • http://shlifovka-pol.website/gagutapij4fg6.pdfIn PDF document text
    • http://jesiwufap.iblogger.org/bhola_baba_ka_gana.pdfIn PDF document text
    • http://ver-alex.website/what_size_tires_come_on_a_2007_chevy_impalaateke.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/pumelofatavijurilhdp38.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/42006075863.pdfIn PDF document text
    • http://italywow.pro/miziziwegofibuwitemugiejha.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/ieX5icf/2976368916.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/tilujufapiwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mebezoworo.rf.gd/punigetuwawibiguxanabe.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_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 5832 bytes
SHA-256: 8765b68b4b5f58e63d735ff6a6e59410cd73a9fdb561ff680296bdb4620bdb9a
font_01_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 10776 bytes
SHA-256: 7285b121fe27a80f2ad772a97b8366cbb22325ec5777371c84413fa85d44bcc4

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