Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8c735f53ae76b2…

MALICIOUS

PDF

70.9 KB Created: 2021-03-17 01:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 820d3bb03051b16c95bd88f0de799d5d SHA-1: 503a608bb9d05a77e99b660a363601c1c44f5a08 SHA-256: 4d8c735f53ae76b22e040c6665ce9f5c8482dba4c318df800ddaefb887784b12
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of a PDF_SEO_LINK_FARM heuristic and ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The embedded URL 'https://mezovuduw.ru/wix?keyword=pokemon+silver+prima+guide+pdf' is particularly suspicious, masquerading as a game guide to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/wix?keyword=pokemon+silver+prima+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/dutaxato/MIT1Dha/princess_nail_beauty_salon_brooklyn_ny_11216.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/new_moon_jan_2021_pst.pdfIn PDF document text
    • https://sulagumafiwez.weebly.com/uploads/1/3/1/3/131383207/2d8278d.pdfIn PDF document text
    • https://rexerobebaru.weebly.com/uploads/1/3/1/8/131872155/4edb57e9c8e.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ghhiibd/2628925353.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/ghFThjH/premium_rpg_dragon_lapis_apk.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/zagojawivag.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/9f4793218c.pdfIn PDF document text
    • http://medesutaduj.22web.org/30732608190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_7a69124975d04e9c826ad499e140cc99.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_d0be06ad52a84efbb8a2c91506a6ba19.pdf?index=trueIn PDF document text
    • http://mafonoxerinomif.epizy.com/79509733427.pdfIn PDF document text
    • http://pevexuzuzuku.rf.gd/cadena_de_valor_bimbo.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_3dce2246d5104a42bce7e797f1b323de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/rules_by_cynthia_lord_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/dimowodisijobetatusivap.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/lagu_blinding_sunrise_gurenge.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/verifica_analisi_logica_terza_media.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/dd_forgotten_realms_god_of_death.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_bf426a86a91f469b96f7f499a931ed10.pdf?index=trueIn PDF document text
    • http://wizigipixe.atwebpages.com/90710839818.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/ifr_enroute_chart_guide.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_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 5484 bytes
SHA-256: f5a88ed7b1f3843bda47222e987718ce4ee07584bacbd67c71a1a48c674f8ff9
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 10840 bytes
SHA-256: 2adef86fe6765958102f4722f5480b84d32d6739a36da9bc06b85477f0fd816d