Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c33cfc5f8d5e13d…

MALICIOUS

PDF

74.8 KB Created: 2021-02-19 17:04:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d0ea908cb04ac3aa382746bc1dba042c SHA-1: 60db125d30b79b70d981d2060eb84d9953672e30 SHA-256: 8c33cfc5f8d5e13dccc196593a70d13e864d7dffb75a37fa500f2f57331144f6
134 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous links, many on disposable hosting, suggests a link farm designed to redirect users to malicious content, likely a second-stage payload. The document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=finite+element+method+pdf+free+download PDF link annotation
    • http://zebolalifitu.22web.org/64557242641.pdfIn PDF document text
    • https://kagejiwuj.weebly.com/uploads/1/3/4/0/134095923/ed520ddc.pdfIn PDF document text
    • http://nukowivoxom.iblogger.org/civil_engineering_excel_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5fdbac4bb5b32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fe0ebaf34b22.pdfIn PDF document text
    • http://nobipobis.22web.org/google_chrome_video_extension.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fdfa041732e7.pdfIn PDF document text
    • https://kobuwejen.weebly.com/uploads/1/3/0/8/130873730/tavizesatisaposexeso.pdfIn PDF document text
    • http://ladukusuga.22web.org/xozom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_602c97d15ff2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nipimixo.epizy.com/bebosurigupuroragij.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/bsf_tradesman_recruitment_2019_form.pdfIn PDF document text
    • http://lidiremuvuzanas.rf.gd/tuwonegakakolabu.pdfIn PDF document text
    • http://zumepif.rf.gd/checkbook_register_template_by_vertex42._com.pdfIn PDF document text
    • http://gasigigi.rf.gd/lewis_structure_molecular_models_lab_answers.pdfIn PDF document text
    • http://majilutiwuxas.rf.gd/leicester_weather_report.pdfIn PDF document text
    • http://bixivanudupona.epizy.com/plant_systematics_simpson_free.pdfIn PDF document text
    • http://morufigalolo.rf.gd/biology_quiz_multiple_choice_questions_with_answers.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_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 5148 bytes
SHA-256: 1b5ddd9e22c30d15029d591d1cad97cb169bc6a469204f5b14f81ca080bf1781
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10532 bytes
SHA-256: 95b5a9d02db5e4f1009003630614e39f4c6c363a3eab54f2fe99da3f43a5506c

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