Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cd37b8a13b6f4e…

MALICIOUS

PDF

72.4 KB Created: 2021-03-29 22:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e1dea466539dc1311bea7b191389990e SHA-1: 6e89d54c058c520ccdb7e75d3b4ca74045d9d2ed SHA-256: c1cd37b8a13b6f4e975f4ca5f7751f08dc82d18b0ce3fe6b562d877003a26a68
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/wix?keyword=word+equations+answer+key PDF link annotation
    • http://widonatozeg.mypressonline.com/22281073875.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/2e5d59bc5a2c6d8.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/calcutta_university_registration_form.pdfIn PDF document text
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/jutekowajujosoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5fcca8ce14f8a.pdfIn PDF document text
    • http://mifilud.iblogger.org/grapher_5_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379732/normal_60044fde173b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5fe6b4921a247.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/kosufusavusub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_600ecfd6d3a1c.pdfIn PDF document text
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/jawipagagituwodux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_60567157746ed.pdfIn PDF document text
    • https://nimamadud.weebly.com/uploads/1/3/1/8/131856523/9370535.pdfIn PDF document text
    • http://tiwigibafofovit.iblogger.org/80259784324.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/augustan_age.pdfIn PDF document text
    • http://wovegibexakebof.iblogger.org/cen-tech_automatic_battery_float_charger_reviews.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/9710043126.pdfIn PDF document text
    • http://vuvisopubalakur.iblogger.org/drawing_apps_for_pc_free.pdfIn PDF document text
    • http://vebenuzan.22web.org/sole_s77_treadmill_low_speed_error.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dotopaku.atwebpages.com/fadiwosip.pdfIn PDF document text
    • http://tizepadeda.rf.gd/official_backgammon_rules.pdfIn PDF document text
    • http://seviboki.rf.gd/23299139020.pdfIn PDF document text
    • http://pudevagaradala.epizy.com/85664288794.pdfIn PDF document text
    • http://muwalolerede.epizy.com/audio_cutter_video_er.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_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 5184 bytes
SHA-256: bdc8d8bcf3bee55b1740cfdf52ce6822f32a3ec10c9cb0dffde7c9975487190d
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 10452 bytes
SHA-256: 4e2a2fc71eb810e754772b8708f2ee254ceb69411dbefe7ac2cc6f8cf5c3270f

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