Malicious PDF — malware analysis report

Static analysis result for SHA-256 7651d0ab3d8cbdf1…

MALICIOUS

PDF

70.8 KB Created: 2021-03-06 04:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a99e01d1475db5cc2b7538faaee38be3 SHA-1: 957c12b8227aa83c177254af95efab77269baef4 SHA-256: 7651d0ab3d8cbdf13fcf3ce1792ff612646c2bad8e375540f8bb9185ae0bdf28
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm designed to manipulate search engine results. The primary malicious URL is mezovuduw.ru, which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains keywords related to the malicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=troy+bilt+pony+tillers+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444092/normal_5fea2ecb5e892.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/ihh6qNZ/art_therapy_certification_colorado.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/wRhh6hb/ink_master_cast_season_12.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/7878744.pdfIn PDF document text
    • https://linikakisevokeg.weebly.com/uploads/1/3/6/0/136098208/d7b2de3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421959/normal_5fe3dd035eb63.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/4704229.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/jjogj3f/65728349125.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/3dedd999ce082.pdfIn PDF document text
    • https://kapovisawok.weebly.com/uploads/1/3/4/6/134652754/zusagizofizogudasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_60136d6b8b1a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vajefam/performance_parts_for_honda_fury.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/41498155783.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/benefits_of_community_gardens.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_fa0d439fc84945c4832eca08998b883b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/pojupowivoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/75388898592.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_7b72a9788a5146019a2e4afe69b47397.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xelimewat/3d_offline_games_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/time_management_group_activities_for_middle_school_students.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/58399395301.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/3571977534.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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 5088 bytes
SHA-256: 1b2b6d74a3733250eb722edb38fb7a73c13d771e4a9e7ae1917dfb917f297b25
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 10816 bytes
SHA-256: de3d2229da91628f37ee309edb2cde96a4b1985c70ebe210e6ea4b899a6cf225

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