Malicious PDF — malware analysis report

Static analysis result for SHA-256 657b8cf512e65e88…

MALICIOUS

PDF

85.4 KB Created: 2021-04-05 09:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e110b5c16661c83b0ea785139e84be23 SHA-1: 58dc160478a7c84ec8022bfe60991c9579a5334e SHA-256: 657b8cf512e65e88e37a0f7e322b9e510e9e7ad711dbd35b671cb04b850854d1
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/123?utm_term=breeding+guide+dragon+city PDF link annotation
    • http://gasolotiravizid.sportsontheweb.net/64039898167.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/96158113867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494140/normal_6041a832b5996.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/hdbhcgh/97130627701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_6018ed5d8a298.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/ladef.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/wovopunoxevumitojitodo.pdfIn PDF document text
    • http://jutamokotodoto.iblogger.org/cyberpunk_2077_gameplay_leak_today.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/jagijbt/nyt_tiles_game_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/fZyKHf4/class_dojo_student_login_poster.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://tonunipuwe.rf.gd/kathi_sandai_tamil_movie_songs.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_d14266439e2846f58149b50da17ecf4c.pdf?index=trueIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_8a2b6f5082f14f90a973899e8bd3de64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/23288042585.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/20036538483.pdfIn PDF document text
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_1d0224d1c64b4e6db7be38824a008df0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/47159136219.pdfIn PDF document text
    • http://sirovorisolilu.rf.gd/82899155641.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_62e62d351cb64d939793cacbe9300aab.pdf?index=trueIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_2959c3549034485ba709560b20253f24.pdf?index=trueIn 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_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 4928 bytes
SHA-256: 92a25d7a79fae0c441e9a67ca863f1a4013e5f796a5e2551e7714925f6f6e5f6
font_01_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10716 bytes
SHA-256: 92e6b505ba325abf4cadf2fa18039afec27b28bf9d464b496f617d798ece417c
font_02_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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