Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8dc088c6b1d6ec…

MALICIOUS

PDF

78.8 KB Created: 2021-03-13 21:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7840c3941792b6948204d437b4e3f522 SHA-1: 116a947e4e7cfa925f75633e3013eecf5129e339 SHA-256: 5a8dc088c6b1d6ec2eeb690f2002a7b90a59777e8d15c86bdb9e03929312ee90
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, 'crophysi.ru', which is likely used to host a phishing page or download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'The school for good and evil book 1 recap'. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

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://crophysi.ru/strik?utm_term=the+school+for+good+and+evil+book+1+recap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5fdbd8f1db003.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/86006685465.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/15263887143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5ff69dfa203c5.pdfIn PDF document text
    • http://smartline58.ru/bejuvuguzevaty7wd.pdfIn PDF document text
    • http://hdvideo.design/favobejazufurujuz3e7.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/simple_pencil_drawing_ideas_for_beginners.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/bejasezawunilepumuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_600918a2ba3b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476301/normal_60018087c7f08.pdfIn PDF document text
    • http://oneshops.space/justin_bieber_top_songs_freeqo07w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_60339ec74119f.pdfIn PDF document text
    • http://cyberlife.store/canela_de_velho_literatura38a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_5fd0d66509d20.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/how_to_change_oil_generac_gp5500.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_5fec2e09e75f6.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/pizivurapab/sebiwekasubisab.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/ho_chi_minh_city_tourism_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/dell_precision_m4600_usb_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/xusutafebojivawu.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_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 5684 bytes
SHA-256: a558b3afd5018f6dc1283cf61d04e0b0fdf0d1112e89211b772c877f1edd70bc
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 11384 bytes
SHA-256: 8cef714105176670216e290314371afa1ef7edcacbe918eaaa9b80cf6d1e8dbd

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