Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ece3e4467950f9…

MALICIOUS

PDF

69.2 KB Created: 2021-02-23 13:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c8349acc8786435dd229a1fcea94b2d4 SHA-1: e5a902aa646bc302e86358b8354fcb8505c737ff SHA-256: a9ece3e4467950f94cff253027556c55e803b6c5bf0de8bb361bbd0fca55a1f4
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 an embedded URL that redirects to a website designed to appear as a search result, likely to trick users into downloading further malware or revealing sensitive information. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, reinforcing the phishing and 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://baarspo.ru/wb?keyword=word%20shortcut%20keys%20for%20strikethrough PDF link annotation
    • https://cdn.sqhk.co/fomezawelud/hiiioTW/telepsychiatrist_piedmont_behavioral_services.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418764/normal_5ff8489c06c0f.pdfIn PDF document text
    • http://xebajar.22web.org/bingo_song_lyrics.pdfIn PDF document text
    • https://siraxaroxaran.weebly.com/uploads/1/3/1/4/131483069/xobokawipuvufetunix.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/ebjahij/gobisodubovatewoga.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jiT3Cnv/35141615786.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosurigazo.epizy.com/five_nights_at_freddys_1_free_download_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/osmosis_and_osmotic_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/kindle_will_not_charge_or_turn_on.pdfIn PDF document text
    • http://susejukeb.epizy.com/certiport_browser_lockdown_3.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/fisicoquimica_castellan_descargar.pdfIn PDF document text
    • http://tirixerunifadi.rf.gd/bodurojokexiga.pdfIn PDF document text
    • http://fogevodazeta.epizy.com/latest_google_play_services_apkpure.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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 5220 bytes
SHA-256: 234c77ad265245fcba021a2b2441176a69f912db813327c900b10a758c891064
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 10560 bytes
SHA-256: 30106685c16938e3c2c03832780d6c9789311b2725c3f4a4742e0f87b1c16ad0

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