Malicious PDF — malware analysis report

Static analysis result for SHA-256 a389df8a7a08e0e7…

MALICIOUS

PDF

82.6 KB Created: 2021-04-01 15:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c2d8f1e08838422019c1708495df25cc SHA-1: 303fb7ea467c27f6eca7e40bd4a7f3acc906752b SHA-256: a389df8a7a08e0e74178351f381dc7f725f292543050d8872f538f4936bb90bb
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'https://midufefew.ru/strik', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to educational standards, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=common+core+ela+language+standards+grade+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500678/normal_60242884f231b.pdfIn PDF document text
    • http://septiki-rf.website/ncert_solutions_for_class_9_science_physics_chapter_work_and_energylnaps.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/39096316075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_60304b3c79a1c.pdfIn PDF document text
    • http://gidpopiteru.com/44422995846ymrrl.pdfIn PDF document text
    • http://frut-tree.site/kali_linux_android_tools_installhelqi.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/ctpBjib/bingo_bay_free_game.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/wigajuxitig.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/hdgRIie/how_to_decorate_a_cake_with_sprinkles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fd03928e5cd1.pdfIn PDF document text
    • http://fojefojegut.medianewsonline.com/carbonatao_do_concreto.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/icjddgd/dorikaguminulilewefinozu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453743/normal_5ff15948d26e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/samsung_note_10_live_wallpaper_apk.pdfIn PDF document text
    • http://vunonam.atwebpages.com/14040081666.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/75613489737.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/75228292367.pdfIn PDF document text
    • http://lugimeviguv.myartsonline.com/29900336792.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/behaviorism_skinner.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/xupegoxofitezozomal.pdfIn PDF document text
    • http://nuvebabe.atwebpages.com/58261047256.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 5328 bytes
SHA-256: 8189d4c4517432f28d9a60774fb1d951b17a9c652824f520bd24c8bc4b33f697
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 11256 bytes
SHA-256: a03502fc1de988f43af599cbd464e055a99015a14907cd68f5aa226670db7a70
font_02_sfnt_off0001273a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 16304 bytes
SHA-256: 9ff23d0d75b3f3a9da2b76f51a52b68247a09cf64fde197bcd28557b74c3c026

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