Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8b13bfb00c124d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-13 13:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 592bfcb89c246a527b07961de4ff14f8 SHA-1: 2cc430ffae7f6ddd77ed6a714b3d65d08b73b7db SHA-256: 7f8b13bfb00c124d0aac6a5870de6f6244f30ced34d417cf55b1406d7156626a
96 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=brainstorming+games+android PDF link annotation
    • http://hihikane.space/agricola_solo_series_high_scorelkk2x.pdfIn PDF document text
    • http://freud.icu/how_to_avoid_gaining_weight_after_gastric_sleevemllgu.pdfIn PDF document text
    • http://jakartapro.xyz/honest_work_a_business_ethics_reader_4th_edition9ncqm.pdfIn PDF document text
    • http://pagixuzipalopa.iblogger.org/case_study_report_format.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/35962010537.pdfIn PDF document text
    • http://teren.fun/arduino_uno_wireless_moduleswu40p.pdfIn PDF document text
    • http://petersikdar.com/wedejamomaludaxorfi26m.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/wifiduxezo/kumoxazefawekatafaronod.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/is_heating_oil_smell_dangerous.pdfIn PDF document text
    • http://titomozuluvexov.epizy.com/buvonuvisigik.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/pulonapusag.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/vetejuzeduvon.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/melofibojenakakun.pdfIn PDF document text
    • http://larisakexifa.epizy.com/grade_6_math_worksheets_ontario.pdfIn PDF document text
    • http://jonegukum.epizy.com/properties_of_addition_grade_1_worksheets.pdfIn PDF document text
    • http://mosujala.rf.gd/hamlet_shakespeare_rose_theatre.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/77585039376.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/womiwejofim.pdfIn PDF document text
    • http://bupixifebinare.epizy.com/41354855142.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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 5164 bytes
SHA-256: 1a99cf4d98494d744b5d0e2977014fe44bef75f390c3773419ffe7626ae0aaa5
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 10584 bytes
SHA-256: ee865fb630b0007cf53348dfbafa497628ee7829fba56962299b2e71d382ab9b

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