Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea1dcaa1f972d7f…

MALICIOUS

PDF

80.8 KB Created: 2021-02-26 05:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4246df5646082a46facabd611b27cc82 SHA-1: df247dd2e7b193ee58aece013ec2f4c445674b8d SHA-256: eea1dcaa1f972d7fa0d063370f19ec28cf14c6ff0e61fac100e2047c8677bd62
126 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 and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=z+score+table+calc PDF link annotation
    • http://prequester.online/tetokorigezibikaj1wp23.pdfIn PDF document text
    • http://spainsale.pro/minn_kota_autopilot_vs_ipilothbae5.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/gihh2ge/army_builder_warhammer_fantasy.pdfIn PDF document text
    • http://fresh-ita.fun/45750986913bvvuf.pdfIn PDF document text
    • http://monstergym.ru/history_of_education_questions_and_answerst7u5j.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/jjavXjP/python_2._7_online_compiler_jdoodle.pdfIn PDF document text
    • http://newsportstechnology.ru/voronelutuvevoghh7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_600d4b95b94b9.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/eQ7ddaM/download_game_glory_ages_samurais_mod.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/2038625.pdfIn PDF document text
    • http://mamontov-net.cc/catfish_prices_per_pound_2018sb8ho.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokevigaku.rf.gd/99043765328.pdfIn PDF document text
    • http://repofifimi.epizy.com/export_outlook_2010_contacts_to_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 4892 bytes
SHA-256: 17fc6c3cd99bef36648a95007347f2934562769f2c9fdb89996fa96138e0833d
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 12008 bytes
SHA-256: 2122ff35bf853c395527fdfba1ef2d30c1383023c8934876c1b292fd82346e46
font_02_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16112 bytes
SHA-256: 366b2a3ed9b44e620159a8175e6f9935b0189d17b94b4d5ccfd5980b0b155f3e

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