Malicious PDF — malware analysis report

Static analysis result for SHA-256 104e5790fdee07eb…

MALICIOUS

PDF

124.3 KB Created: 2021-04-04 14:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96aae65186ef5c89ebb7aa20d7df2495 SHA-1: dab51a6959024e36bba6bf6386dcf808fb4beb90 SHA-256: 104e5790fdee07eb898ca494fc6c800fa8a8b6bfe1b939d0e458da6a176de193
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, mezovuduw.ru, which is likely used to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to 'limits graphically practice worksheet'. No scripts were extracted, but the presence of external URIs and the overall classification 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://mezovuduw.ru/wix?keyword=limits+graphically+practice+worksheet
    • https://cdn.sqhk.co/dutaxato/jgBhiif/submarine_simulator_naval_warfare_mod_apk_unlimited_money.pdf
    • https://cdn-cms.f-static.net/uploads/4456114/normal_603a5a5e7a1bf.pdf
    • https://cdn-cms.f-static.net/uploads/4447885/normal_60343658e1d4e.pdf
    • https://cdn-cms.f-static.net/uploads/4374976/normal_600ae771e26d6.pdf
    • https://cdn-cms.f-static.net/uploads/4370285/normal_6015ab30bafe7.pdf
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5fe5597ef2018.pdf
    • https://cdn-cms.f-static.net/uploads/4408583/normal_603d03679fa56.pdf
    • https://cdn-cms.f-static.net/uploads/4451542/normal_606872490ab7e.pdf
    • https://cdn-cms.f-static.net/uploads/4376362/normal_5fdc1bd52b944.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_60485e5a35fb2.pdf
    • https://cdn.sqhk.co/lokabawopup/WdShjji/samsung_split_screen.pdf
    • https://static.s123-cdn-static.com/uploads/4370266/normal_600680fdf2738.pdf
    • https://cdn-cms.f-static.net/uploads/4382208/normal_605d70737f505.pdf
    • https://cdn-cms.f-static.net/uploads/4454280/normal_5fd2393c2357c.pdf
    • https://cdn-cms.f-static.net/uploads/4445114/normal_601d20832467f.pdf
    • https://cdn.sqhk.co/juviwonu/cjaWicc/599029514.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rawesaragegugar/balu_full_hd_video_songs.pdf
    • https://s3.amazonaws.com/rufonali/99618630436.pdf
    • https://s3.amazonaws.com/sedowedi/14257967432.pdf
    • https://s3.amazonaws.com/wokesabisevo/latest_vce_software_free_with_crack.pdf
    • https://s3.amazonaws.com/vukumesoj/book_mockup_psd_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13a.bin
38c1c9b33ab0d7ca902b97caf403eebe447a37a5cde16ced4b4a18c635de2987		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 62488 bytes
font_01_sfnt_off0001acc0.bin
f1c75b54c1d1621e421fbb38ae91dbe54f65bc46ad156190303ce9433a76efd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACC0 5548 bytes
font_02_sfnt_off0001bf8f.bin
e9f39ac531caf0ab010ab64aa70b5639567beb54d2aff6da04153ea4cd36dd78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF8F 10696 bytes

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