Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7e559f07ae9d9b…

MALICIOUS

PDF

69.9 KB Created: 2021-02-01 02:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c420dcb62d447710b3a5b6bb2d126310 SHA-1: 70990973f37d24098ee08236714566c0cfd5e70d SHA-256: ef7e559f07ae9d9b41655a7e965b602e69378bab4b97b82da191f55965a75cd6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics confirm it's a malicious redirector and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=osrs+troll+slayer+task+guide In PDF document text
    • http://coolmag.biz/temusapunanebiviwulevot6s4gc.pdfIn PDF document text
    • http://dress-russia.ru/94548493588uoto7.pdfIn PDF document text
    • http://imedo.ru/edexcel_a_level_further_maths_topich54r0.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/hcjjmjj/25274406832.pdfIn PDF document text
    • http://service-hire.com/vinisivotabedinun0hl5v.pdfIn PDF document text
    • http://artdebug.site/interaction_1_reading_answer9vzri.pdfIn PDF document text
    • http://astrohelp.space/arena_of_valor_redemption_code_north_america_2020gz9w8.pdfIn PDF document text
    • http://yatvoyya.fun/super_adventure_jungle_adventuresjlwpw.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/Bthiiib/88205930088.pdfIn PDF document text
    • http://ipoteka.net/853296784129m8bk.pdfIn PDF document text
    • http://nat-fru.space/nobamonajiroo66c9.pdfIn PDF document text
    • http://qwertyujg.xyz/97907952486z8xma.pdfIn PDF document text
    • http://menbp.online/73401211650eh4y3.pdfIn PDF document text
    • http://koteyarn.moscow/ragnarok_eternal_love_leveling_guide_blacksmithkoyzv.pdfIn PDF document text
    • http://naturmilans.fun/fnaf_world_story_guideig5id.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/jirKrwF/5388942549.pdfIn PDF document text
    • https://cdn.sqhk.co/kesufetumo/bZjiUCs/tezuresevebano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 5188 bytes
SHA-256: 36f25f96067724ba3c8a96e72c6020684a785450a82daa355cc65e2964748248
font_01_sfnt_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 10792 bytes
SHA-256: 4cfb334559199f1d6536b66debadf68b55ed7f02bec2dea59c7538019faa2e96

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