Malicious PDF — malware analysis report

Static analysis result for SHA-256 398f64b22cb6a8b5…

MALICIOUS

PDF

64.6 KB Created: 2021-02-15 09:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1b3e41e235f443b383d9be2533c5d7f5 SHA-1: d57a834608610ec50bfce74062565d020132daa3 SHA-256: 398f64b22cb6a8b5065c28b766eda9d8fed8aa6498f2db6c013f67eaf320a9d2
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into downloading a payload or visiting a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'percent yield worksheet answer key'. No scripts were extracted, but the presence of an external URI and the overall detection suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=percent+yield+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413578/normal_60115f271c0bb.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/33312873944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_60104b5d961f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365567/normal_5fdf65772f1c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_5ff0227224543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5fddb2e33341d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_600d5c498ce55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_5fe977972e02e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6029d813a39d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454671/normal_5fc6ae1d476c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fd640334ed2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwopugivowivo.rf.gd/twin_sheet_sizes_in_inches.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/chemical_engineering_technical_interview_questions_and_answers.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/blaupunkt_sbw-_01_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/pejirevano.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/guide_de_demandeur_d_asile.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/90863969394.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/40155350523.pdfIn PDF document text
    • http://duxejuxaxeze.epizy.com/79437127075.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/animal_skull_deformities.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_off0000c0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DB 5288 bytes
SHA-256: d490f9bbe01b9f3c3a4686df6ca399fed180c58cd204f3b5b57c277da718c8f1
font_01_sfnt_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 9968 bytes
SHA-256: c3b850270dd7f248c751829f53c07094038ab6883de91a368b0062eb3ff525c6

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