Malicious PDF — malware analysis report

Static analysis result for SHA-256 3856624bb9fc7244…

MALICIOUS

PDF

77.1 KB Created: 2021-03-20 15:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e124e64466122ae5effdf62a8d6202a SHA-1: 5bbf629b515360bf2adff0028b4269baef24f041 SHA-256: 3856624bb9fc7244e9518c4b50a6005cd9077bd3715123b6083f3d93f6b14285
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, specifically 'https://resalured.ru/award?keyword=interpreting+financial+statements+pdf'. This URL is presented in a way that suggests a lure for financial statement analysis, but the ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing. No scripts were extracted, but the presence of an external URI in a malicious PDF points towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/award?keyword=interpreting+financial+statements+pdf
    • https://cdn-cms.f-static.net/uploads/4489983/normal_5fe903cc3dadd.pdf
    • http://rufojoto.22web.org/introduction_to_data_science_course_syllabus.pdf
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fd7b42bd25e9.pdf
    • https://cdn-cms.f-static.net/uploads/4490129/normal_600cc9274306c.pdf
    • http://vavenuvukubanav.22web.org/kivarelegodeduvizewonup.pdf
    • http://serikanipesemo.iblogger.org/injury_incident_report_template_word.pdf
    • https://cdn-cms.f-static.net/uploads/4467027/normal_600c450121847.pdf
    • https://static.s123-cdn-static.com/uploads/4367305/normal_5ff5f8cf3bb0a.pdf
    • http://bobimesufapi.iblogger.org/java_convert_inputstream_to_file.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_54e33792d71c4c2398f5fa23d9929548.pdf?index=true
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_9722eaeaf07e4918aa85c074564110a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d3f06bf-33f3-4edc-ab7f-0a6d327a3d12/26962893885.pdf
    • https://uploads.strikinglycdn.com/files/157cd922-2790-40ab-bae8-5d375f211827/is_a_4_qt_crock_pot_big_enough.pdf
    • https://s3.amazonaws.com/firigugixujotov/21883558010.pdf
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_5674d865cac5482c8a28923bc796e09e.pdf?index=true
    • http://tivapatovike.epizy.com/10633282507.pdf
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_f2208992a2474edbbdeb4d236afebc4b.pdf?index=true
    • https://s3.amazonaws.com/jeromisixinolib/bbt_bank_locations_in_durham_north_carolina.pdf
    • https://s3.amazonaws.com/xarojapi/vamigezijosilogunokaxinul.pdf
    • http://lawubipala.epizy.com/spotify_web_player_android_apk.pdf
    • http://tibakofe.epizy.com/jexiwuwixamevofe.pdf
    • https://s3.amazonaws.com/sorogamat/56439971015.pdf
    • http://posivunoloreweb.rf.gd/swimlane_flowchart_template_free.pdf
    • http://jawimazo.epizy.com/critical_care_nursing_diagnosis_and_management_free.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_87711a2a1ce94cd884e23db4ddbeafa7.pdf?index=true
    • 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_off0000f004.bin
55768fc41044bfc9fe9ee40b13387ab6e5ffc6339ccc9e6ece941863f95f0871		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 5412 bytes
font_01_sfnt_off0001025b.bin
8437c5b6e2d7183a55a7eafcc636824552841e67181476ddf8cc2ce534e4e051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 10652 bytes

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