Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4d2d54dfdae0ed…

MALICIOUS

PDF

107.8 KB Created: 2021-05-09 09:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3eca3c598828c22db47e098d6a728e63 SHA-1: c80e9dd7de7c27c6b2b33d3ac757617899718ac6 SHA-256: cc4d2d54dfdae0edaaf8297d485b090e58161fd219a6ec45a30a3c4826e8227f
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, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=fingerstyle+guitar+nails+or+no+nails PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5febc82d046ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_606e44be0ecd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_6052ad6944b34.pdfIn PDF document text
    • http://gagafelame.22web.org/44744789355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_606e26aa23fa0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddece1d-fe17-4369-97c4-38ea06024a7d/32298799395.pdfIn PDF document text
    • http://xexazopaxabet.epizy.com/catholic_baptism_rite.pdfIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_11d804b9236f4e45b7d4b177576d5c0c.pdf?index=trueIn PDF document text
    • http://ripotuteruposa.rf.gd/feasibility_report_on_poultry_farming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f7a995-d16e-4194-acd7-9f83a0e485cf/how_to_charge_panasonic_eneloop.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_e521786e7c0b44759a64f69ca4176a59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d203d41d-c0b2-439a-abed-31ace518a42a/tubibejinotisu.pdfIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_eb315ee5790a471d999cad8574b09c5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2786b967-0c1b-470a-9f33-a9a09212c89a/27833987134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b16c923-42bc-4f23-a47b-100310c4aa76/sat_2019_book_college_board.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_4f906d9394e14508a6f6ddc2ccf92909.pdf?index=trueIn PDF document text
    • http://gomiguru.epizy.com/ivan_bayross_pl_sql_book_free_download.pdfIn PDF document text
    • http://wowisosanazo.rf.gd/digital_marketing_agency_proposal.pdfIn PDF document text
    • http://borovob.epizy.com/interjection_grammar_worksheets.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_off0001686c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686C 4912 bytes
SHA-256: 6f56c9bbb2f366ae975b9b307e9f04f0df921e4c96a48a6d06b91ea783209244
font_01_sfnt_off00017940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17940 12036 bytes
SHA-256: d0e8f081c8db70200611f9cf6383efde946b0ba6a9d90a6d418a84f3d1760369