Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78908c0ec5bbaa1…

MALICIOUS

PDF

70.8 KB Created: 2021-02-11 06:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fbe53823939579371b6603ebd57d9540 SHA-1: 7549dfb49830a3ef3af255a82c0eb0daa0a9bb44 SHA-256: c78908c0ec5bbaa13bc22c4d100177da307b36ee474085b4ac741fe1319c85b6
96 Risk Score

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, 'leonvi.ru', which is likely used to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to 'Crash the chatterbox' and mentions wkhtmltopdf, indicating it's likely a crafted PDF designed to trick users. No scripts were extracted, but the presence of external URIs and the overall detection profile suggest it acts as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=crash+the+chatterbox PDF link annotation
    • http://gemajesubon.22web.org/is_11513.pdfIn PDF document text
    • http://gufutaca1.xyz/aashiqui_2_songs_full_hd_1080pv0ort.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5fd6c380650a7.pdfIn PDF document text
    • http://letnesil.xyz/new_elementary_mathematics_syllabus_d_2_solutions0g19q.pdfIn PDF document text
    • http://zimefob.22web.org/nostalgia_yanni_piano_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5ffc2e6f2d320.pdfIn PDF document text
    • http://beliyden.xyz/761925210040yert.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/baglama_tuner_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/chemguide_electrophilic_addition.pdfIn PDF document text
    • http://delitareba.rf.gd/10406094328.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/automotive_repair_information_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/66164217340.pdfIn PDF document text
    • http://rupeguv.epizy.com/windows_8_animated_gif_wallpaper.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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 4968 bytes
SHA-256: ba48d8b572ef057881dbc8239f2dfacafd7ce740083ffad69442f5fe72e33d77
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10676 bytes
SHA-256: 0635e2521e04757828a36e9dee306247600a1d7fa52c5712894b4ac4634229d1

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