Malicious PDF — malware analysis report

Static analysis result for SHA-256 b090b0c59301a866…

MALICIOUS

PDF

73.7 KB Created: 2021-03-14 16:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 16c262663a205b27ad5f61fc87620428 SHA-1: cdffe5c0921da68c018620ac1a62f6b7182f7631 SHA-256: b090b0c59301a866888ccdb6b591f63c00584ebbb7037f6ffe6ddd532430adc4
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that appears to be a lure, disguised as a physics textbook. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the phishing or malware distribution vector. No scripts were extracted, but the overall structure and heuristics point towards a malicious document designed to trick users into visiting a compromised URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=libro+de+f%25C3%25ADsica+1+medio+2020+pdf+chile PDF link annotation
    • https://cdn.sqhk.co/zesonixiv/jhgheNX/jumpstart_games_3rd_grade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482012/normal_5ffdb83e6ef23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_604318453592d.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/e5Qvgc8/64994060494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5fd8067aa0888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368249/normal_5fcdc9c47e4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_604d44a81bcfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_60140f7791e88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366623/normal_5feee47803d7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_601d6ff0096c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472481/normal_5fec078760b8d.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/idK8iaA/building_tap_house.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_6033d60e2c76b.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/mNjfibX/battlelands_royale_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_60413d92d1027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijawiravutul.epizy.com/number_location_tracker_app.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/90303358707.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/systemic_circulation_vs_pulmonary_circulation.pdfIn PDF document text
    • http://xagonerokivuj.epizy.com/2305968769.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/dajiziwoz.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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 5856 bytes
SHA-256: c069da26fdbcb8cb20f9e1e0d92b5502bf40b4de96d24cf1955c3e9a41ad75dd
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 10968 bytes
SHA-256: 0dcc8950656a00b050b6dfcc35eea362947235c0a6bf9d9889720d56104185df

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