Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac8184ed9652c0c…

MALICIOUS

PDF

111.7 KB Created: 2021-03-23 12:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f9bbced3075a38044c95523bfea8a9ce SHA-1: 5a4c57f0117fcd17cee2e7c33d9784b909cddeca SHA-256: 9ac8184ed9652c0c310fc918f0f8fd183bdc6ea4c5dc0bdb7085d40912f21732
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=what+is+the+season+2+of+tokyo+ghoul PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482018/normal_603faa642620c.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/fhhePjd/envision_math_2._0_volume_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60295891bdccd.pdfIn PDF document text
    • http://degitowexara.iblogger.org/pufegebupusoxab.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/xR0PjjN/skillmill_treadmill_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/4hhNjgi/beta_lactamasa.pdfIn PDF document text
    • http://jurelireroxux.22web.org/swing_trading_for_dummies_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391642/normal_5ffe48636f73e.pdfIn PDF document text
    • http://temezisabekazev.iblogger.org/essential_dutch_grammar_henry_stern_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_603f31fc30767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_6054da69dc218.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/1jdifgc/23350804061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lolekubem.epizy.com/la_celestina_resumen_por_capitulos.pdfIn PDF document text
    • http://giduzorim.epizy.com/camera_raw_photoshop_cs4_mac.pdfIn PDF document text
    • http://topawod.epizy.com/beauty_girl_game.pdfIn PDF document text
    • http://gevorewububew.epizy.com/tejijofozadubebopu.pdfIn PDF document text
    • http://netidufek.rf.gd/blade_runner_william_burroughs.pdfIn PDF document text
    • http://sujotoginejo.rf.gd/53867529850.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_f30bdd185b664b0bb6676278286bddf6.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_4fc2104e215d4ffe8f86058f64132fca.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_7e37d988fb36406f9e6a2619aee771cf.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 39188 bytes
SHA-256: d26d1fc7e567e4a62f3eb233d846fa004f80243489d663988730fe99491b560a
font_01_sfnt_off0001793d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1793D 5244 bytes
SHA-256: a89efe0e90664d5bb7232dd28f55572d0683bfd411ca37330d7bccceb9bcc5f7
font_02_sfnt_off00018b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B36 11472 bytes
SHA-256: 1a5dfbaab4bec61b3c3c6ac54abd9988e5671fa8fd81ce7900c82bf86e545a3e

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