Malicious PDF — malware analysis report

Static analysis result for SHA-256 2593d31526692956…

MALICIOUS

PDF

88.1 KB Created: 2021-03-31 00:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 293f57b121342efeb14b2e90625a88be SHA-1: 6bac2d2d1098fcc60372f051ec95b73f53243b3d SHA-256: 2593d315266929564b83406848589158293d43aa627c21972a9c1da8a2b9b227
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to English language exercises, likely to trick users into visiting the malicious URL.

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://golowaki.ru/award?keyword=angielski+zadania+b1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452372/normal_6035d4a4a1021.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/siklus_akuntansi_biaya.pdfIn PDF document text
    • http://lelofewadu.iblogger.org/23093502852.pdfIn PDF document text
    • http://vabetovopux.66ghz.com/battletech_beginner_box.pdfIn PDF document text
    • http://ruwulepukapuk.iblogger.org/additions_to_esther.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5fe4efb747914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fd930b7a62c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_6043a269959b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wewamamewiler.atwebpages.com/mapamundi_con_nombres_para_imprimir_blanco_y_negro.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/troy_bilt_horse_tiller_tine_shaft_seals.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/15141878612.pdfIn PDF document text
    • http://zikenonuto.epizy.com/open_innovation_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/comprehension_worksheets_4th_grade.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/stihl_hs80_hedge_trimmer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/14721130925.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/10912331707.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/marlin_model_80_magazine_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80dbfa40-0eae-4c2b-88a9-577d8693530b/resaridiz.pdfIn PDF document text
    • http://pesipobigon.rf.gd/6281677743.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/febusab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb961bd-f379-422d-a6be-ffdf7dcfdd1b/probability_density_function_using_excel.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 5408 bytes
SHA-256: f8aaec3364206151c6e53e2ef7a46824b40356f6aee962a48dde65140b8f43e8
font_01_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 12152 bytes
SHA-256: b6a2298e3fc00525639d424065b0326fa15c7f6100adbbe294f79d660d274c9d

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