Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f754d1dabe62f20…

MALICIOUS

PDF

84.8 KB Created: 2021-03-17 17:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36fdaf6ba22358c97128394139ad4a7 SHA-1: 6b0183f2869c52b0beb8039f31ddbddd79e10f20 SHA-256: 3f754d1dabe62f20513d9d2b7e45e8b420a303e784e1bda0513a40e14351eb51
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to 'jumiwimov.ru', which is likely a phishing or malware distribution site. The PDF structure itself appears to be intentionally malformed, indicated by the 'PDF_DUPLICATE_OBJ_BODY_INCREMENTAL' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=persona+4+tower+social
    • http://duzusedolatepe.mypressonline.com/xunanajamunafef.pdf
    • http://komakukamuduwi.iblogger.org/historia_de_la_educacion_en_mexico_linea_del_tiempo.pdf
    • http://iuts.space/remington_14_inch_limb_and_trim_partsl3s16.pdf
    • http://nabavawuzafurur.mygamesonline.org/armature_reaction_in_synchronous_machine.pdf
    • http://obzorov.site/casio_wave_ceptor_leather_strapqprhe.pdf
    • http://vafakewa.iblogger.org/xudufinoxugag.pdf
    • http://zeboxagekej.sportsontheweb.net/febopivatat.pdf
    • http://hotel-engels.ru/40969197821vii2n.pdf
    • http://instapriz24.online/xilik9c6mh.pdf
    • http://dk-inc.xyz/integrated_chinese_4th_edition_volume_1_character_workbook9efis.pdf
    • http://tozofuji.scienceontheweb.net/79419519749.pdf
    • http://guzexesuge.mypressonline.com/vfr_sectional_map_legend.pdf
    • http://sdfsdfsdf.shaketorch.com/79636165573.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_2e088347ef1a4f7e9dfc97413957a9ba.pdf?index=true
    • http://widifusi.myartsonline.com/lets_talk_in_english_conversation_16.pdf
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_c80593f138e54bc08232cfdb23f234e9.pdf?index=true
    • http://jezevenakos.myartsonline.com/32625003276.pdf
    • http://jimijafo.epizy.com/jexaviragixatufo.pdf
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_a303733a69434c028ee3e55d5fa152b5.pdf?index=true
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_deffdab057c84f628ce1c0d1114986b6.pdf?index=true
    • http://kagiweluxipo.epizy.com/xozoxekarivujiminovugim.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f238.bin
bb16d900616a03d7fe2f83c73d8cf14bc7d68371bdd8bd0a73a8c8e11c106aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 4032 bytes
font_01_sfnt_off000100a0.bin
68611380c6e97d448b5b1225d7cd999a59cb70c4ccda4f681d0c694adf49c87f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 4760 bytes
font_02_sfnt_off000110de.bin
6ac896be934185782bfd3dc4dc4aac7787dcca25a3e2aa7df3a4323b6a1c4b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 11624 bytes
font_03_sfnt_off0001375c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1375C 4324 bytes

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