Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e5a065b5990ffb…

MALICIOUS

PDF

77.1 KB Created: 2021-03-06 11:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78065659fcc7cbf35476e6bacfbad55b SHA-1: 9a52b283860537a63e98fdd1133c416d1070a4ca SHA-256: c4e5a065b5990ffbf6d69a02ac4260633b954ea684b39686907ebb42c8e80333
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating that some links point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple disposable hosting links further supports a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • 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.
  • 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://dafemum.ru/123?utm_term=memory+jogger+pdf In PDF document text
    • http://kmikaerfs.ru/wajitekufalc631c.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/jijcQhc/godus_wars_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/T4tijY9/archery_bow_wood_daily_themed_crossword.pdfIn PDF document text
    • http://kuvesukide.iblogger.org/61082346887.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/eJjclih/i_remember_you_movie_explained.pdfIn PDF document text
    • http://segwaywheelchair.ru/87720931128ls37q.pdfIn PDF document text
    • http://zoxejusozowevo.iblogger.org/90664257727.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/zmodo_8_channel_h.264_digital_video_recorder_manualt9vdl.pdfIn PDF document text
    • http://store50off.info/bebumigebopefoxotebojlo0iu.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/PrifhbC/regal_theaters_cda_idaho.pdfIn PDF document text
    • http://sevulow.22web.org/best_new_android_phones_under_15000.pdfIn PDF document text
    • http://pristav.pro/sizikemibijejebopegazox953e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/hbcWnge/scrapbookpal_coupon_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://filabos.epizy.com/98510244440.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_c68802e247484b36917623674b9bdb15.pdf?index=trueIn PDF document text
    • http://wipidomi.rf.gd/82878811049.pdfIn PDF document text
    • http://fiwujugisijema.epizy.com/21879573358.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/hangzhou_food_guide.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_95aac5e49e604292aa04e9d3173e93fa.pdf?index=trueIn PDF document text
    • http://monejorudazan.epizy.com/82124314872.pdfIn PDF document text
    • http://ginokaze.epizy.com/telugu_annamayya_audio_songs_com.pdfIn PDF document text
    • http://ladorum.epizy.com/90486070732.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_0517ec80db594921996354f0ffd30e3d.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_4920ac14f22142d99eec7653dcfca8ed.pdf?index=trueIn PDF document text
    • http://golokelu.rf.gd/woderonexexozijorifuwa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 4676 bytes
SHA-256: 2e667b645364d361f598e7a277ad4820c0f345398cec17ea8634460dcd0671b0
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 11156 bytes
SHA-256: 374904a69f7dd48aa348eea066ce16a6579cd9ecae957ca513be0f761546d142
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333