Malicious PDF — malware analysis report

Static analysis result for SHA-256 013805e7b74bed27…

MALICIOUS

PDF

62.3 KB Created: 2021-02-25 13:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 53415bd65435a9283e22f86d1914cd0e SHA-1: b19d4a348132632a9dd3685328710e9828b195d8 SHA-256: 013805e7b74bed275b37e0d3ee7c130921c4c0a87b868214a044b6f39ab5453a
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and links to known malicious redirector infrastructure. The primary malicious link, 'https://crophysi.ru/award?keyword=does+wing+chun+work+in+a+street+fight', is designed to lead the user to a potentially harmful site. The presence of malformed exploit streams and the ML classifier's high confidence score further indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9565

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/award?keyword=does+wing+chun+work+in+a+street+fight In PDF document text
    • http://bosemefawixuwov.mypressonline.com/duzazuvafupumika.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/fake_xbox_live_codes_that_work.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/kotumo.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/xeropizuwe/endangered_species_list_2019.pdfIn PDF document text
    • http://kedomaxi.epizy.com/cisco_ccna_packet_tracer_ultimate_labs.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/all_souls_cemetery_long_beach_ca_staff.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/lotesedisifomoso.pdfIn PDF document text
    • http://vurasoda.rf.gd/nokia_android_one_update_policy.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/9292793378.pdfIn PDF document text
    • http://denakisewir.epizy.com/bed_wetting_sheets_king_size.pdfIn PDF document text
    • http://zutadefado.epizy.com/waxemakekopaveguvutotazur.pdfIn PDF document text
    • http://kababotatage.epizy.com/twilight_full_movie_in_hindi_dubbed_part_1_2008_download.pdfIn PDF document text
    • http://regujivabi.rf.gd/10277179801.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 5264 bytes
SHA-256: b9db98470c62870c7c131b9d9781e1703d82770af855a7ca61f53d663b0594e4

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