Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c73dd1c5f23f7d…

MALICIOUS

PDF

116.8 KB Created: 2021-06-09 11:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d12b9491ee467979afa95a0deb323c60 SHA-1: 3e52145e7e8c28927f574c2cafb221847d5a781e SHA-256: a4c73dd1c5f23f7d8f841dc0e92551e420bebd0ce5d914e80e814c229e7d1b78
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gimoguvi.ru/123?utm_term=chambers+global+fintech+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446400/normal_606e9aa493def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_605c31d973c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_604d233076168.pdfIn PDF document text
    • https://talokawibameze.weebly.com/uploads/1/3/4/0/134000376/32aa730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478402/normal_5fece5d0529dc.pdfIn PDF document text
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/mozunawilitugi-vukimaviwivum-xotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_600dcf63611aa.pdfIn PDF document text
    • https://busejupeguwija.weebly.com/uploads/1/3/0/7/130740624/4481542.pdfIn PDF document text
    • https://lasonitukaxo.weebly.com/uploads/1/3/4/8/134889758/1535072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2fc0678a-4315-42f9-9a12-d2e2594161c0/what_does_the_arrow_in_a_chemical_equation_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc52c686-2c49-48eb-994d-2a9eaef79fa0/vopobikavadub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f31e12-b2e9-4c58-ab4c-b9f821a21a55/calories_bojangles_4_piece_supreme_dinner.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144750072/what_does_brownish_discharge_mean_before_your_period.pdfIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144529155/ruzuvufobepijizigek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbc871b-001e-45d1-91a4-9cf76e39f795/power_book_3_ghost_cast.pdfIn PDF document text
    • http://juboxeraris.pbworks.com/f/font_family_cdn_link.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/12735895612.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/f/geometry_proof_practice_worksheet.pdfIn PDF document text
    • http://ritijix.pbworks.com/w/file/fetch/144525411/zekajiverinawug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587ade20-65d4-48df-9cb9-f79c7a3c8e39/asus_m2a-vm_hdmi_cpu_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076a2231-94ca-413d-99ab-d2d38d00f098/86915584027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c6a753-47f3-462e-a190-165d40bb78d4/smart_car_repair_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f59ce1-3f1c-470e-bb58-6d41c43b24f0/zudovekaviwaz.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/w/file/fetch/144927747/30933590145.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18110 5480 bytes
SHA-256: 88c8f20c72412cf1614878e348f3937891fa8d0e8f07f102709e1203e81a7ea5
font_01_sfnt_off0001938b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1938B 10608 bytes
SHA-256: 722767bf5cd0857747edd1ac0922799dc6fc8876e22ba9d9cbe7d423971d8872
font_02_sfnt_off0001b7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7B2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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