Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b37c0381b8e3e2…

MALICIOUS

PDF

78.8 KB Created: 2021-02-19 01:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a8cbe703d61c2c1b3e741ea5cbdd52af SHA-1: f1de4d397220a8f2cd71ee3ac22732a6ff1110a0 SHA-256: 32b37c0381b8e3e242407d15830c4164cb4abd8672f1391b7ac558668f2c476b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+to+beat+link%2527s+awakening PDF link annotation
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/c8d3a15eb818739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_60133f58b9528.pdfIn PDF document text
    • http://jatepot.22web.org/tixalekotifesomunav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_6008f85a4c604.pdfIn PDF document text
    • http://puzijebiwukixi.iblogger.org/video_creative_brief_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483867/normal_602ae8bd72cb2.pdfIn PDF document text
    • http://nofawemew.iblogger.org/abbott_laboratories_annual_report_2014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5fd9779d3cc31.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/pegeriladekeduv.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/kenovafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovajiw.rf.gd/hello_and_goodbye_athol_fugard.pdfIn PDF document text
    • http://zatafefot.rf.gd/80837814465.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/archaic_or_dialect_form_of_you.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/hand-_arm_bimanual_intensive_training_cerebral_palsy.pdfIn PDF document text
    • http://bufarudewigufeb.rf.gd/report_of_culminating_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/procurement_policies_and_procedures_template.pdfIn PDF document text
    • http://wotalajo.epizy.com/application_of_biotechnology_in_food_processing.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5048 bytes
SHA-256: 77d390922964e3482fb7e4d168bc1db0fe5e75a863b0e64e7b67f1bdbacacb83
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 10356 bytes
SHA-256: 88d3a5306e6bce477695be71fb823de312c26b0434d7aca11bf758184a4dd179

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