Malicious PDF — malware analysis report

Static analysis result for SHA-256 df611d36f5c95a02…

MALICIOUS

PDF

76.0 KB Created: 2021-04-04 20:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 984813d2b306221b30e3d0d31435bd9e SHA-1: ec4f0df509dd3a28f60eb1fb23a63014ddce1ae4 SHA-256: df611d36f5c95a02bba574e87404c687a6cdcd8b61ce866112c290f7be695b4a
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that appears to be a lure for downloading a generic audio driver, which is a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it is designed to redirect users to a malicious site.

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://crophysi.ru/strik?utm_term=generic+audio+driver+windows+10+download+dell
    • http://kabofatifeda.22web.org/andela_home_study_download.pdf
    • https://cdn-cms.f-static.net/uploads/4481676/normal_605b691a47a3f.pdf
    • https://cdn-cms.f-static.net/uploads/4370768/normal_60673f900b786.pdf
    • http://dasazopemobor.mywebcommunity.org/59087231343.pdf
    • http://juzajikadig.22web.org/fotisadifegususujasiva.pdf
    • http://fesunasisodenod.getenjoyment.net/nios_assignment_first_page.pdf
    • http://giwewigipebi.medianewsonline.com/is_grant_income_taxable_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dedinavesute/6-1_skills_practice_angles_of_polygons.pdf
    • https://s3.amazonaws.com/tikofaketonub/69841482912.pdf
    • http://misusiv.rf.gd/empirical_review_of_training_and_development.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/aleister_crowley_magick_book_4.pdf
    • http://wuwedilejom.myartsonline.com/kingdom_man_tony_evans_movie.pdf
    • http://salevena.rf.gd/bolesaw_prus_kamizelka.pdf
    • https://s3.amazonaws.com/sisaxu/alpha_urdu_word_meaning_in_turkish.pdf
    • https://s3.amazonaws.com/rawesaragegugar/79010256443.pdf
    • https://s3.amazonaws.com/fatikonavori/gardening_australia_vegetable_planting_guide.pdf
    • http://wuguwusilabibax.epizy.com/renaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed18.bin
a2e33ddec3067a28f5d8c20f53b437860f64a2de70fc7d1c04c0c784ab6ca81a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 5312 bytes
font_01_sfnt_off0000ff51.bin
aec2e19b0997b568ac3fc35d5e52d2592a183222e6f4e85555df9ecb62890d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 10348 bytes

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