Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a7fb3f0c336c63…

MALICIOUS

PDF

77.4 KB Created: 2021-04-16 23:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8485c8c550dcde91e361d8ec0029a18d SHA-1: e70892c7d5bc6a3f4ff66b3092cbf9de8816f7a9 SHA-256: 77a7fb3f0c336c63db271a0fa202e55aa6c4b0f27f9d68c7587e8368305d711c
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that points to a suspicious domain, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'classical guitar exercise book' to entice users to click the malicious link.

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://druttle.ru/strik?utm_term=best+classical+guitar+exercise+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477162/normal_5fc6ab19df72c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366305/normal_5fdd48928d7e5.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/dgchdey/68972521117.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/29923711454qlkzh.pdfIn PDF document text
    • http://eurofamily.pro/tuvonapizetabi4k4w9.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/jNieWRJ/prop_hunt_portable_mod_apk_1._3._3.pdfIn PDF document text
    • http://labincom-med.ru/calculus_concepts_and_contexts_3rd_editiona2p1h.pdfIn PDF document text
    • http://peludofnor.fun/jeriwurkeapq.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/california_king_bed_sheets_targetggd8t.pdfIn PDF document text
    • https://fupakukenig.weebly.com/uploads/1/3/4/2/134234610/e817cc8e13.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/limasewidebujinomeji.pdfIn PDF document text
    • http://youtube-subscribes.com/pokimane_twitch_rivals16ytf.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/tedowafomaru/16858493893.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/convert_vce_file_to_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/online_marriage_certificate_application_form_delhi.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/learn_hindi_in_30_days_through_tamil_free_download.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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 5288 bytes
SHA-256: 8fceaebbaa54c2ff5b157549ba6c65631bdf530a0b41d174fb7da24a4a8afbea
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 11412 bytes
SHA-256: 829c052b2a16ced433a8f1b35e1b59ff7bcdef6c7d5904fb2cd178b8a3c21511

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