Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef51043d1b48c08b…

MALICIOUS

PDF

75.2 KB Created: 2021-02-03 06:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8c76b033ef1055de1f5f5c991db63059 SHA-1: d002e7e97da4ef2230e9442aca2c88c066b2171a SHA-256: ef51043d1b48c08bd937bab21982abf9f4c76956623e3ba8a2dc6c4aa3eafa0d
116 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that is presented as a manual for a water heater, likely as a lure to trick users into visiting the malicious site. No scripts were extracted, but the PDF structure itself facilitated the malicious URL delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://seumenha.ru/123?utm_term=atwood+water+heater+manual+mpd-93756 PDF link annotation
    • http://zivudib.66ghz.com/angiospermas_exercicios.pdfIn PDF document text
    • http://voxamuzovo.22web.org/98897164470.pdfIn PDF document text
    • http://wufutawolemipa.22web.org/6080557484.pdfIn PDF document text
    • http://sizijevoji.iblogger.org/diamondback_energy_inc_annual_report.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/jupudizadid/punjabi_couple_images.pdfIn PDF document text
    • http://miviguwi.epizy.com/word_label_template_avery_5366.pdfIn PDF document text
    • http://lurorozowuwa.rf.gd/bafujupilodujux.pdfIn PDF document text
    • http://muxawij.rf.gd/dovira.pdfIn PDF document text
    • http://xuvotawelotito.epizy.com/51205848901.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/camp_x_ray_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/buxopesorukaj.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/49838506617.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/qr_code_scan_barcode_scanner_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/carnivores_2_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/adobe_indesign_cv_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/41709852452.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/safavotose.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/57674821076.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/93227976033.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/ludosowatunoxezop.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_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 5812 bytes
SHA-256: 11e105551bb709a246c9bbbd5554b4d271ae7f09ed0a8d2148162591a11fd044
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 10656 bytes
SHA-256: 288edcfcb4fc745a68b32330ce2cbfb45477538d8827016d5bed3dadfbf6f291

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