Malicious PDF — malware analysis report

Static analysis result for SHA-256 855740491867cbec…

MALICIOUS

PDF

70.3 KB Created: 2021-02-22 11:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 33f444eea5eb4fd92f4be74a6b0d2ca3 SHA-1: c454a1f0dcc6de51f5694e832a5473f319040d26 SHA-256: 855740491867cbec72f301212915831881f920f7ba276f2a25b4ffce48f61ab6
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, masquerading as a worksheet answer key. ClamAV and ML classifiers have identified this file as malicious, specifically a phishing trojan. The presence of an external URI and the overall classification strongly suggest a phishing attempt designed to redirect users to malicious content.

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://baarspo.ru/wix?keyword=what+are+waves+worksheet+answer+key PDF link annotation
    • http://amandeepsadyora.com/946385945539r3qz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fd69802cf5be.pdfIn PDF document text
    • http://converstarget.ru/kalender_2018_junin1a4b.pdfIn PDF document text
    • http://vbnmcxz.xyz/my_many_colored_days_movie9m56w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411501/normal_5fccc3370a9e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/liligenalox.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/8221680354.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/24110990629.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/java_jdk_for_32_bit_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/posefadixinavelotu.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/duvoweti.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/zodimufoma.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/saccular_vs_fusiform_aneurysm_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/44141691791.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/aashto_m_145_espaol.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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 5072 bytes
SHA-256: 5ea49e8411b352095d934633017593f12cf405c4ef10ed6092d88433eaf590a1
font_01_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 9952 bytes
SHA-256: 7f0485873395434297ece6473bbc8b2f815d7275739b2aa3674078d21639303e

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