Malicious PDF — malware analysis report

Static analysis result for SHA-256 539f0f91c815d0b1…

MALICIOUS

PDF

76.9 KB Created: 2021-04-09 01:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c31c4f42d93f78a20ab33577a24725ae SHA-1: 3a716dafa09d2fb2e45a0c5a440d6546c7d3ed18 SHA-256: 539f0f91c815d0b10012289a87c1112d56bc6df4ef040227dea72470459de218
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that points to a suspicious domain, likely intended to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to 'intellectual courage'. No scripts were extracted, but the presence of an external URI and the malware detection strongly indicate a phishing or malware distribution attempt.

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://dafemum.ru/strik?utm_term=what+is+intellectual+courage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472206/normal_6055a39fb9f4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5ff1df1939694.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/wihjbif/roridejumipojof.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/Giechbc/jeremawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369142/normal_60074ec5472ea.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/jhANR1J/61745703929.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/jukoxisojow/camera_focus_perfect_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902595dd-00da-4c4c-95fa-95ab0d83f96f/supekifenifi.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/muwamomomemedimekur.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/fedunovikamodilijenapiza.pdfIn PDF document text
    • http://madujenorenugax.epizy.com/scholarship_essay_examples_about_yourself.pdfIn PDF document text
    • http://jipidabaxepej.epizy.com/adobe_premiere_video_transition_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/madajejoseduxufoxidi.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/80137307557.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/36735213799.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/calculo_de_la_molaridad_de_una_disolucion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e43d17-63e1-44f0-ba85-b26704d7a97c/english_vocabulary_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/concepto_de_parestesia.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/wibijenanexaginijiwogug.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/57397178456.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_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 5072 bytes
SHA-256: c3af2a92be06b3978f863d8331e7e106ee8d2a60f6390b955281d4c2332b2bdc
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 10664 bytes
SHA-256: 72f0facb267e5b73886ceafe2fbdc09d1a1639af95b6a71752f39bdd449ef169

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