Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c66d435ef5b0ea5…

MALICIOUS

PDF

76.8 KB Created: 2021-06-05 01:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 58e341b9724bfdb4ab9238f7877d18d4 SHA-1: f21efe6e7f69189f42a116f32ca28b14e9f82f2b SHA-256: 5c66d435ef5b0ea5132754e5327ce08289fb7e857da0be0b2e9dbfa5613e5a51
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'https://catamma.ru/pbw?utm_term=go+math+grade+6+chapter+5+lesson+5.4+answer+key', which is likely part of a phishing lure. The document body, though heavily obfuscated, appears to be related to search results for educational content, suggesting a pretext for directing users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/pbw?utm_term=go+math+grade+6+chapter+5+lesson+5.4+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451374/normal_603e8da929ab6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370073/normal_6005450b3a384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454556/normal_60017a3f5b76f.pdfIn PDF document text
    • https://fisabovetusita.weebly.com/uploads/1/3/4/5/134597566/9cfc6fe629d384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492286/normal_5ffc00a2cde34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_601a054ca1c55.pdfIn PDF document text
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/3503524.pdfIn PDF document text
    • https://zojajodasu.weebly.com/uploads/1/3/4/3/134354616/zofularademisu.pdfIn PDF document text
    • https://vanuvinuvur.weebly.com/uploads/1/3/0/9/130969573/7407063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_6014dd8a51125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5ffce503a43a3.pdfIn PDF document text
    • https://pogupevupawigo.weebly.com/uploads/1/3/5/2/135293313/genifilupugozi-zuxesog.pdfIn PDF document text
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/sufevewowubi-getulajowokeki-vejamex-tidutiponuvuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beratirupo.pbworks.com/f/sda_church_manual_2020_edition_download.pdfIn PDF document text
    • http://bamedun.pbworks.com/w/file/fetch/144457704/80976491584.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144633261/43000437377.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/holt_mcdougal_literature_grade_8_answers.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/mini_militia_mod_unlimited_gas_and_ammo.pdfIn PDF document text
    • http://sejiliki.pbworks.com/f/vabekovewoze.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/supplier_satisfaction_survey_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 6172 bytes
SHA-256: 60392a16e15cdf125b099271ad2e729d8bc304c204574b0bd4b88037426a4b74
font_01_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 10668 bytes
SHA-256: eab7f5b72e0f0c68715b16c2776646eb4501ac7f5ec9507ee0cb258614681830
font_02_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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