Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b52435c6307138…

MALICIOUS

PDF

73.9 KB Created: 2021-03-12 13:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36c32ae8a4023455bf1e6ba516bde84d SHA-1: 70ad94631e2dd9ccf49d4273aaabbde46165c17f SHA-256: 43b52435c6307138a601773b3a6ae3cb4df4d7c3ba57f7f36d98d00ba25127cc
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with the primary suspicious URL being https://jumiwimov.ru/123?utm_term=appvalley+for+ipad, which is likely a lure for users seeking the 'Appvalley' application. The document body, though heavily obfuscated, contains references to 'Appvalley' and the authoring application, suggesting a deceptive purpose. No scripts were extracted, but the presence of multiple unknown URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=appvalley+for+ipad
    • http://tijudiwulewanuw.getenjoyment.net/lawikukerumis.pdf
    • http://puboreru.22web.org/ferrari_california_2020.pdf
    • http://gunotuje.iblogger.org/palosabubomotib.pdf
    • http://mosebuzixat.mywebcommunity.org/roserutafipebebulebutele.pdf
    • http://fabujisaw.mygamesonline.org/ruxisekusez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xopugup/formato_hoja_de_vida_2020_colombia_word_gratis.pdf
    • https://uploads.strikinglycdn.com/files/bf952bed-9cb5-4fa9-bc16-c070c7b2e0ff/52463413299.pdf
    • https://s3.amazonaws.com/rawesaragegugar/92138306116.pdf
    • https://s3.amazonaws.com/likadojivivofu/arabic_keyboard_for_android.pdf
    • https://s3.amazonaws.com/pubopelej/30915388850.pdf
    • http://dotemifa.epizy.com/buderus_logamax_plus_gb142_error_codes.pdf
    • https://s3.amazonaws.com/jinabom/41440761711.pdf
    • https://uploads.strikinglycdn.com/files/1e68dbb3-f909-4e10-930a-d22f1f5b3d83/mowanij.pdf
    • https://s3.amazonaws.com/limepusotanal/pizagomudenuzarifutureson.pdf
    • http://buvelijixuzumu.epizy.com/which_statement_best_describes_the_theme_of_song_of_myself_brainly.pdf
    • http://fubegamo.epizy.com/gegekuzise.pdf
    • http://rijevugez.epizy.com/rifewafanokadorupep.pdf
    • http://zakutipatijike.rf.gd/calculator_apk_hide_photos.pdf
    • http://dokonofuliwuki.rf.gd/valerie_winslow_classic_human_anatomy.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e486.bin
26e1739b886c9917206b8d2249e40518e68836b5cfc43cf1765828680eca0891		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 5008 bytes
font_01_sfnt_off0000f5b4.bin
f03d78700b469267bbbc401a7f1e896660880332f59ab6a03321cdbbc8c1302d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10836 bytes

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