Malicious PDF — malware analysis report

Static analysis result for SHA-256 82249df2da5f315f…

MALICIOUS

PDF

71.0 KB Created: 2021-06-01 12:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 191df890a0c752e71ad3f985ffb3bb76 SHA-1: eb1b58d795e3feb9981a656f8c70d8a90a05490c SHA-256: 82249df2da5f315f4fafca6dc58b2386d061c4d25b59399eb78623e8579107d2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a page that appears to be an answer key, likely a lure to encourage clicks. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://archism.ru/pbw?utm_term=preterite+vs+imperfect+worksheet+answer+key
    • https://cdn-cms.f-static.net/uploads/4456389/normal_6066f4f909169.pdf
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ffd0abe42f0e.pdf
    • https://static.s123-cdn-static.com/uploads/4484633/normal_600390f7d185e.pdf
    • https://cdn-cms.f-static.net/uploads/4459324/normal_6034da8a7e6c3.pdf
    • https://cdn-cms.f-static.net/uploads/4392647/normal_60678ac9c4a1b.pdf
    • https://static.s123-cdn-static.com/uploads/4424347/normal_5ff62998ea23f.pdf
    • https://cdn-cms.f-static.net/uploads/4413835/normal_604b2dc49f6ff.pdf
    • https://cdn-cms.f-static.net/uploads/4531523/normal_60225b4888e4e.pdf
    • https://delosixopefo.weebly.com/uploads/1/3/4/3/134344482/9402941653d.pdf
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5ff2dac436cbe.pdf
    • https://gutamigev.weebly.com/uploads/1/3/1/1/131163772/xeluz_dumulofosetuful.pdf
    • https://cdn-cms.f-static.net/uploads/4485702/normal_6039d1b61fff6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sorawako.pbworks.com/w/file/fetch/144445497/tulotilisev.pdf
    • http://masawumel.pbworks.com/w/file/fetch/144427965/hay_day_mod_apk_latest_version_1_41_174.pdf
    • http://wojipag.pbworks.com/w/file/fetch/144426996/1975876045.pdf
    • http://bovojigu.pbworks.com/f/72246202453.pdf
    • http://zezimin.pbworks.com/f/aye_baysal_genel_beslenme.pdf
    • http://zufiwuz.pbworks.com/w/file/fetch/144447414/spiritualism_and_necromancy.pdf
    • http://kiletejude.pbworks.com/w/file/fetch/144411681/how_to_mix_salt_reef_tank.pdf
    • http://kefimazusob.pbworks.com/w/file/fetch/144424968/diferencia_de_contabilidad_administrativa_financiera_y_fiscal.pdf
    • http://zabodovojif.pbworks.com/f/the_interview_1998_explained_reddit.pdf
    • http://sofutikajen.pbworks.com/f/what_are_the_levels_of_product_and_services.pdf
    • http://lekuzax.pbworks.com/f/xanexokudegedivisel.pdf
    • http://povelin.pbworks.com/w/file/fetch/144422994/56787617088.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_off0000d45d.bin
d999140f30934d773374a24f854848756f4cc96373566cfb06315f06fd535168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 5544 bytes
font_01_sfnt_off0000e727.bin
862d3b7191cceaeb576027c65e0b7f351b3980280414eb91658a5629f3bf211c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 11768 bytes

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