Malicious PDF — malware analysis report

Static analysis result for SHA-256 103e2705b1694916…

MALICIOUS

PDF

68.6 KB Created: 2021-02-24 08:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 71216d1e6f960f32e718c4e7d304dcd0 SHA-1: ea9f86f1be6c7dcf4ee12025993281ab9f188b27 SHA-256: 103e2705b1694916ea11e37b385e13dc3ffc59815b3a0faa45db156eed125193
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a common technical query, designed to mask the malicious intent of redirecting users to potentially harmful websites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=how+to+turn+on+projector+without+remote PDF link annotation
    • https://cdn.sqhk.co/nifodotiriru/c4tr2N1/master_skins_for_roblox_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/fOigzje/finisorexewo.pdfIn PDF document text
    • http://ita-talia.fun/lord_of_heroes_3rd_contractkns59.pdfIn PDF document text
    • http://suguxilaxiz.22web.org/chrome_apk_packager_archon.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/iijbjgV/big_keys_for_typing_keyboard_with_keyguard.pdfIn PDF document text
    • http://qrastenmap.online/19268697677v6jns.pdfIn PDF document text
    • http://com-copyrighit.com/livro_instrumentos_mortais_cidade_das_almas_perdidaslbny9.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/ihjaici/bubbles_png_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_600ac9f6b25aa.pdfIn PDF document text
    • http://difodalutovirub.iblogger.org/ridabozevunovinop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5ff678ae805c2.pdfIn PDF document text
    • http://glossywp.online/descargar_libro_los_renglones_torcidos_de_diosa2jt1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_6023c98fd55c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5fd70f606b3d2.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/ihfjifT/home_assistant_best_device_tracker.pdfIn PDF document text
    • https://cdn.sqhk.co/fudixaxogub/f0gfhgh/pack_master_level_260_answer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwisowaf.rf.gd/bunn_axiom_coffee_maker_troubleshooting.pdfIn PDF document text
    • http://mubizutoperix.rf.gd/neverending_story_netflix_2020.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_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 4880 bytes
SHA-256: 168f1e25302193e853d95c3115dc1e263b68e0784af35a82189da223ec4533d1
font_01_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 9652 bytes
SHA-256: 947ffbb1b08f2ecb135790c6472a68d2be6b2ddbed37829bb4826036b6435ad5

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