Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d7a42a1eb654b0…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 22:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42a150f4337f5131b99b7e83949db190 SHA-1: 44e4a86ca841eabdf6cfd16b59e07dbc5ac450cf SHA-256: e1d7a42a1eb654b0a11f4d0d4813af3bf9fd2e006260b319c90868e396c89dfb
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host the malicious link.

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://maypoin.ru/award?keyword=epigeal+germination+pdf
    • https://cdn.sqhk.co/mamevugixej/Zhije3n/bubedawiruduwedus.pdf
    • https://cdn.sqhk.co/mawejoxejobe/1rpjjhc/ninja_foodi_grill_reviews_consumer_reports.pdf
    • https://cdn.sqhk.co/tovipovo/8Mih3wp/blitz_tanks_war_hard_armor_3d.pdf
    • https://cdn-cms.f-static.net/uploads/4454820/normal_60503ba2b33c1.pdf
    • https://cdn.sqhk.co/toxodimina/nc3cigW/93993778901.pdf
    • https://cdn.sqhk.co/rutunidosaw/bjdShc9/zefegafoba.pdf
    • https://static.s123-cdn-static.com/uploads/4453103/normal_5fe10174717e7.pdf
    • https://cdn-cms.f-static.net/uploads/4415767/normal_60252575a947b.pdf
    • https://cdn.sqhk.co/tabewinudeka/bhepnbM/43465182556.pdf
    • https://cdn.sqhk.co/joxipadij/xggdL7L/goodreads_book_reviews_dataset.pdf
    • https://cdn-cms.f-static.net/uploads/4464871/normal_601bfbf85e73c.pdf
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdf
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5ffa8e1e007cc.pdf
    • https://cdn.sqhk.co/lorotukogof/hajgjig/6976603219.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2cf10c50-231e-45a5-97c6-9fe2309964a6/how_do_you_replace_a_toto_toilet_fill_valve.pdf
    • https://uploads.strikinglycdn.com/files/e47d4c63-9721-40a9-bf14-619426f4bd3b/wizz_air_call_centre_polska.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_off0000e66e.bin
ad1bd12e3139e8516ae09958f17227c52565111509d0150a2fe20b9e0ed1eff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 5140 bytes
font_01_sfnt_off0000f7df.bin
e361c47e5adba9a86dee82a8585869ae7029f303860fa8c28d7ad5100eb3d949		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 12080 bytes

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