Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02ea19b412d9f93…

MALICIOUS

PDF

77.0 KB Created: 2021-03-24 08:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa5a23868c5dd8b43d822d49bac1d445 SHA-1: 56deb247d5422fd7741b058afb14c19f23bb75d8 SHA-256: b02ea19b412d9f93c0aa78b24d2df3aa5a59e596878b94276026094791577e23
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://ponafet.ru/award?keyword=sample+formal+letter+asking+for+permission+pdf
    • https://cdn.sqhk.co/xujurovemu/d74gfon/meme_soundboard_ultimate_2020_pro_apk.pdf
    • https://cdn.sqhk.co/mivijigonof/hfgha6g/cuneiform_cool_facts.pdf
    • https://cdn.sqhk.co/buwuvibija/gdgigjG/sejujozilarifewu.pdf
    • https://vafobuzegigotot.weebly.com/uploads/1/3/0/7/130775214/472bc422dc63.pdf
    • http://xuxetosufuzo.getenjoyment.net/why_socialism_is_better_than_capitalism.pdf
    • http://pixilapusir.22web.org/novi_jerusalim_borislav_pekic.pdf
    • http://bawimip.sportsontheweb.net/colegio_de_profesionales_de_enfermeria_del_sur_de_la_provincia_de_santa_fe.pdf
    • http://jalojewaga.mypressonline.com/ancient_civilizations_and_ruins_of_turkey_ekrem_akurgal.pdf
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/20451343e4b6.pdf
    • https://raminatu.weebly.com/uploads/1/3/4/5/134579417/taduzimu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/cf5eca09-fb03-4fdd-bc4e-797058d9c592/wibuxilosomenavaw.pdf
    • https://s3.amazonaws.com/getizar/riwojob.pdf
    • http://zujisofivo.onlinewebshop.net/65815188613.pdf
    • https://uploads.strikinglycdn.com/files/2cff01d6-99df-45c6-9f13-3765b1e5013f/88264412100.pdf
    • https://s3.amazonaws.com/zedilegol/19941781542.pdf
    • https://s3.amazonaws.com/runuzitexokol/android_adb_drivers_windows_10.pdf
    • http://debukigezi.epizy.com/difference_between_lincoln_and_johnson_reconstruction_plans.pdf
    • https://uploads.strikinglycdn.com/files/70059ac3-317a-4f0c-a028-47ce48919c1a/denon_avr-1513_specifications.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e370.bin
a5dc71308d88d3ea9f18573968c1442ac54eefcf760e791c23c7b685184f68af
pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 5316 bytes
font_01_sfnt_off0000f569.bin
ba49e8b0574918cfd90ebbae5652b2b4cc29d5e7738a68ef0c7d1dc88a3ee74d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10388 bytes
font_02_sfnt_off000118c5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 4324 bytes