Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dc178fded25e40…

MALICIOUS

PDF

77.3 KB Created: 2021-02-12 00:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2a7197ac5fc4714cec301fec12023f9 SHA-1: d77ccc84c4ef750c664dcbb418703970f437f667 SHA-256: a8dc178fded25e40640920530965f320c4a1e43e0db189cfcef5fe78485e3d09
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL that redirects to a domain associated with malicious activity, likely to deliver a secondary payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to educational materials.

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/wb?keyword=precalculus%20practice%20problems%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5fd840fd19a71.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/dO9nnjj/8379912694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_5feaefe31abcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_6009caf91fbc8.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/jgzibgd/20062580675.pdfIn PDF document text
    • http://libralab.digital/additionsverfahren_textaufgabenm1n8w.pdfIn PDF document text
    • http://circus.market/alcatel_2008g_user_guideccaq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493873/normal_5fc5d9eb87ebc.pdfIn PDF document text
    • http://ru-payment.casa/vurozokonoxizereriniluxoonj73.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/YIJ62CE/mother_earth_brewery.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/h99LLML/official_army_prt_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5ffe7ea6e1eac.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/dRtWb4a/68225715733.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/igOM2hj/fimisupuxopoboxet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_6025ae8155c5e.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/Og97Fib/dinosaur_basic_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/hhihchj/96653458876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 5220 bytes
SHA-256: d32de987dda7e25394054465d68c0e5d0d6e36a3328d680e280fce8cde9c021f
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 10708 bytes
SHA-256: c006ae43b8c7f41cb0e45b136ba185560ee0b89b1be203f1d59ca361185696ac
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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