Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8872b3c2b324d53…

MALICIOUS

PDF

75.5 KB Created: 2021-02-08 03:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: eb653a2d12b90ac272618b0cd7b281e2 SHA-1: 1f0274103faa459fc8ecf4dba69b4067ec4ba7de SHA-256: b8872b3c2b324d5365061e6b0c827412f74e5011bc02ca2b0645f7409ba12ab3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text that could be interpreted as a lure, such as 'Fourth and goal wow', potentially disguised as a game guide to entice users to click on the malicious links.

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://baarspo.ru/123?utm_term=fourth+and+goal+wow PDF link annotation
    • http://xosijitede.22web.org/gojatamofelitumibekebikug.pdfIn PDF document text
    • http://bepibolet.22web.org/86676860981.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/1VWrzid/guide_for_free_fire_2019_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_6005e7e09f881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5ffcd97b0854e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_60208145b2ab0.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/hhcgdV8/miwituliburi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5fe00af255d36.pdfIn PDF document text
    • http://dreabling.online/cheese_plant_leaf_templatev52jk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fe972a89f58f.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/susululo.pdfIn PDF document text
    • https://vasoxalevevox.weebly.com/uploads/1/3/4/4/134477515/7283432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuginafana.epizy.com/xapawerijegekiturazoxofe.pdfIn PDF document text
    • http://xawukagolu.epizy.com/84951936943.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_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 4956 bytes
SHA-256: 4b73e69653d4a52d27a2dcfed03b8ed044445c307649fa6dec45e54427d4c87d
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 11544 bytes
SHA-256: f084ee9af7a02c8296938a7f1dc7e0a799e374fc7678682bf5915e313e440757

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