Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc962beae371a56f…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 00:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e04fceea7eb9e2ccc1211ddb6be805 SHA-1: d7cf8ec10a6cf36280ee2dcc4105d6f5e35ff3b9 SHA-256: dc962beae371a56f354f45383bd247f188b8992b883e6c273a4fec5a0474f176
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 URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, aligning with common social engineering tactics.

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://vilenefex.ru/wix?keyword=dilation+and+scale+factor+worksheet+answers
    • http://everydays.space/starcraft_boats_for_sale_usedjd6yv.pdf
    • http://vizilirudigub.getenjoyment.net/35848393332.pdf
    • https://static.s123-cdn-static.com/uploads/4411922/normal_5fe429a5e6478.pdf
    • http://8bitbeardsco.com/metropcs_network_unlock_codeusmzs.pdf
    • http://babysampler.com/what_does_playing_cards_in_a_dream_meann07xr.pdf
    • http://gupupokuvugal.22web.org/flyff_leveling_guide.pdf
    • http://xanuxitawunavi.iblogger.org/animals_worksheets_for_kindergarten_esl.pdf
    • http://xuridikak.22web.org/old_filmi_audio_song.pdf
    • http://pop-marketplace.ru/jomolawakudilupato2g5s.pdf
    • https://cdn.sqhk.co/vevodusoxif/SgcijaB/rumavedojanezetuveken.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://mizozibobekujul.rf.gd/free_english_comprehension_worksheets_grade_6.pdf
    • http://gapumigexoze.epizy.com/rmv_driving_test_cost.pdf
    • http://wujarid.epizy.com/fekodomaza.pdf
    • http://gagafexekoxoseb.epizy.com/83811010073.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_off0000dd3c.bin
dc5835b6c8064bbdcc5b6d483d7ac9b752b7539e3ed5a4bdeafcaac74f555dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 5052 bytes
font_01_sfnt_off0000ee70.bin
fa19991a1866f079e0a69e474da5158179eb44d4ace93243304764efe2838c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 10332 bytes
font_02_sfnt_off000111a8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 4324 bytes

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