Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e94465e29ae3de…

MALICIOUS

PDF

74.5 KB Created: 2021-04-01 08:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 01eac489df2a8f4ff92e51f67e28ca8c SHA-1: c163fc1772d7ca369afd986352e8ba88e69a3859 SHA-256: 16e94465e29ae3de2abb94f9aad7cc4e75b8d9b6472068b0f14b78862403d37d
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous external URIs and is structured as a link farm on disposable hosting, suggesting an effort to obscure the true malicious destination. The document body, though heavily obfuscated, contains keywords related to free downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/award?keyword=free+biochemistry+pdf+books+download PDF link annotation
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/lesilegewijes.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/45310674965.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/4178045.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/448822.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/eKahaij/sekefamudirad.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/binelujobigolimigojopiso.pdfIn PDF document text
    • https://tebadigizowi.weebly.com/uploads/1/3/4/1/134109241/25365788730b48f.pdfIn PDF document text
    • https://gewafikawesi.weebly.com/uploads/1/3/4/0/134016732/josuraseseduler.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/AggtBjh/musica_discoteca_anos_70_80_90.pdfIn PDF document text
    • https://zakosolegim.weebly.com/uploads/1/3/5/3/135337695/1224612.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/cyberpunk_2020_sourcebook_download.pdfIn PDF document text
    • http://lemosinixetafox.iblogger.org/25252618048.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/bomixiwusagu.pdfIn PDF document text
    • http://felebom.iblogger.org/igel_ud3_spec_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekezixurul.onlinewebshop.net/nelukamujixika.pdfIn PDF document text
    • http://gujodelabugujaf.rf.gd/baahubali_tamil_4k_hd_video_songs.pdfIn PDF document text
    • http://kufisidus.epizy.com/skullcandy_hesh_2_work_with_xbox_one.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 5748 bytes
SHA-256: 6aab98fa1b682d849bd14f9440705332480b0d17ba6cb0cf80aec58a77ccdd54
font_01_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10840 bytes
SHA-256: c2b70e7f6f8a2ddebf110824343465fca39bdfc66bfc6b8cdb57da11a9dc8335

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