Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20ef3db1a937293…

MALICIOUS

PDF

100.1 KB Created: 2021-04-03 12:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 723eae3f21bfd7d96332c3ee9d36ebcd SHA-1: a72ea87b04b5db00e732114359b6fc94d1386f5e SHA-256: e20ef3db1a937293f6b870ddce3d2c1720ea701612a92c700bb757c34d0a1add
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, with a high risk score. It contains an embedded URI pointing to a suspicious domain, 'midufefew.ru', which is likely used to deliver a payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to educational material ('density worksheet physical science'). No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://midufefew.ru/wix?keyword=density+worksheet+physical+science PDF link annotation
    • https://cdn.sqhk.co/pawanipol/jbfdMis/sky_whale_planetside.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/6053273.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/renozixas-siteloja-vafegilodurube.pdfIn PDF document text
    • https://pekiwuvigefarov.weebly.com/uploads/1/3/4/7/134766825/6384574.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/recetas_de_comidas_para_bajar_de_peso.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/gfhd3MC/scrambled_words_solver_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ijSNOSY/wimidefebuduwinedu.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/tofozanijabuje.pdfIn PDF document text
    • https://xadupokunarufi.weebly.com/uploads/1/3/2/7/132710624/waporodub.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/comment_prsenter_une_bibliographie.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/gwSjfJR/dr_viruch_in_apple_valley.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/3896972347.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/dhiCgfx/87010351870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_653e4abaa0474958b7b96d29be031579.pdf?index=trueIn PDF document text
    • http://wepogevadapafa.atwebpages.com/agricultural_science_grade_12_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/didopigutepoxukidulek.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/38056169364.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_20189cddbbb14f8b89576a3a595df06d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/24342068063.pdfIn PDF document text
    • http://vadibulifuwu.rf.gd/runexal.pdfIn PDF document text
    • http://peviworopa.rf.gd/84120828157.pdfIn PDF document text
    • http://vukabufe.epizy.com/34456885274.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/file_khng_copy_c.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/vinuzez.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14147 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00014b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B41 5280 bytes
SHA-256: 248609a20adfe5ee5c34a45688fd281e49938d4753b770779fb898733027fa12
font_02_sfnt_off00015d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4C 10404 bytes
SHA-256: 2e7d0be1ee2c5734f915cec593871f75a6a6c2d91dc3086aadc34ad2197239df

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