Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44591de12c6d9d0…

MALICIOUS

PDF

135.0 KB Created: 2021-06-02 20:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c8cf1853b2486c7ed73203fa2d2607c SHA-1: 43bfadf44e66abfc16acd7394b21d1439a502797 SHA-256: b44591de12c6d9d006015819bdbcfbb4a5ce9765c8dffcbd1219f5bbe88db39b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'huntic.ru' which is likely part of a phishing or redirection scheme. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Maus ii chapter 2 summary'. No scripts were extracted, but the PDF structure and URL heuristics suggest an attempt to redirect users to malicious content.

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://huntic.ru/pbw?utm_term=maus+ii+chapter+2+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468831/normal_6058e1d8d7766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448985/normal_6004e59b52ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_602e656c0a6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_602832e86c398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144421179/82912538995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892c0626-4a98-44cd-99b0-685695c594d8/hamilton_beach_steamer_model_37537_manual.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144483231/71147485253.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/dujibosusorugodalu.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144418296/84172745489.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/68631492868.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/27350274701.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/how_to_prepare_gram_staining_reagents.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144464442/nexamiwojisudimewudemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c00eab1-2d2a-43cd-b860-8c95cf414751/best_phone_video_editing_apps_free.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/best_sensitivity_settings_for_pubg_mobile_no_recoil_2020_with_gyroscope.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/xavigiboxijuta.pdfIn PDF document text
    • http://xibosini.pbworks.com/w/file/fetch/144511545/how_to_cheat_swamp_attack.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/moxufisujexuvibibugekatag.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144426039/madotowavase.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/nemajolomux.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/13341988824.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_off0001cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF43 5380 bytes
SHA-256: 2b46bfc16c0fcc575811308148772a64f3a7aab04160f565e31fae72f0c342a7
font_01_sfnt_off0001e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E176 14028 bytes
SHA-256: 46c018d1cba5a40006a62b2b749e30f1afba549deb69e126fea7341e2a3fbc72

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