Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb37f9f3eee9db85…

MALICIOUS

PDF

75.4 KB Created: 2021-04-30 10:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f289215b05b8f3b8ab4ffede5c36d93b SHA-1: 545f874ea0fc79a5a0180dd30230c261b21b28f4 SHA-256: cb37f9f3eee9db85a3f652f2c3cb3cfc6f9a1be49458de9c8bb2129b5966b247
134 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 pointing to disposable domains, and a heuristic indicates it's a link farm designed to redirect users. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=linear+integrated+circuits+book PDF link annotation
    • http://vovodofozufora.iblogger.org/analysing_school_performance_login.pdfIn PDF document text
    • http://ogranicbio.fun/gapaxitabozixelm9t04.pdfIn PDF document text
    • http://bogplaktnc.fun/anganwadi_workers_application_form88gzx.pdfIn PDF document text
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/riferawer.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/kuriviza_loxux_numanatabibom.pdfIn PDF document text
    • https://kokopepexepu.weebly.com/uploads/1/3/1/3/131379351/b5bbee95cfa.pdfIn PDF document text
    • http://bigtittybella.com/english_to_spanish_dictionary_downloadvlrwf.pdfIn PDF document text
    • https://wozovogunetip.weebly.com/uploads/1/3/5/3/135396590/7741916.pdfIn PDF document text
    • http://kijorifoweb.22web.org/94475590453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78256f8-a57f-4a99-8649-32409f0e56af/nationalism_in_india_class_10_prashanthellina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786ccd81-8901-4b1d-b475-0130ec91da5d/sharepoint_2013_workflows_end_of_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63437d8-9923-411e-b2ce-5add805b55b3/motion_offense_vs._2-3_zone_defense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec2c7dc-47a1-4aab-9e23-2c8c6688f170/how_to_hook_up_bose_speakers_to_onkyo_receiver.pdfIn PDF document text
    • http://lasuwutiganije.rf.gd/editing_and_proofreading_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e975ca38-072e-47fb-a54a-872c83607472/the_classic_slave_narratives_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55838a72-66ae-434f-8723-c355ccbc22a6/gozudagevolujax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0031c3-19be-4826-ab07-9a2f99293156/bowugiragevubexijijabegu.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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 5220 bytes
SHA-256: e8b5c101cc0db3ea6e2f88e6ae62b47b8b22cb11d6057f6dda0a3af7400b8fc3
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 10532 bytes
SHA-256: eb9d48a5b653d65b6e9cb44dbde4915dd99ac4eafb6057f33bf7d6844a6d4fd6

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