Malicious PDF — malware analysis report

Static analysis result for SHA-256 5015f0e149868683…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 05:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f717b78276089964030a0e9498d24e82 SHA-1: 241210628062d683bd409f77589b3064b724e7eb SHA-256: 5015f0e14986868327e2f94dab279259a3a919c3a1d9a47a82a15a844de14ab3
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 pointing to various PDF files, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm structure indicates an attempt to distribute or lure users to malicious content, likely for downloading unwanted applications or further malware.

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://druttle.ru/wix?keyword=applock+apk+download PDF link annotation
    • https://cdn.sqhk.co/vilubofi/A0hekgi/alien_galaxy_shooter_mod_apk.pdfIn PDF document text
    • http://idealica-italiaoficial.site/theocratic_ministry_school_software_macwxnpx.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/adding_decimals_worksheets.pdfIn PDF document text
    • http://arfesopt.com/9531462407n3c01.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/ifsw_statement_of_ethical_principles.pdfIn PDF document text
    • http://robinmani.site/planeacion_para_preescolar_35ak5f.pdfIn PDF document text
    • http://prizyivnik.ru/cisco_packet_tracer_version_5._0_freekfi4j.pdfIn PDF document text
    • http://help-copyrightservice.xyz/munogiznrh7.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/lidimeg.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/igcide6/ping_pong_balls_amazon.pdfIn PDF document text
    • http://trokot-shtorki.online/gimulinjn80u.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/76392493378.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/g6igjbV/rafidulipinisokej.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/zozunapazuputim.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/xozeb/nedob.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/talewiduleka.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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 4936 bytes
SHA-256: 46284c4404320477e4f7661975c4fa9e1e0da888a23c29ee7f974ac5820a4c4c
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10976 bytes
SHA-256: 810db0f27405473fe9ef1d94fdfae3582fe3dfb692a6169f0f98bd7201d1bfbe

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