Malicious PDF — malware analysis report

Static analysis result for SHA-256 d269c3c08b678ee0…

MALICIOUS

PDF

72.7 KB Created: 2021-04-22 17:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 564e35a3d993dd69c1adee1ddb72c46e SHA-1: 625def5d30d125bcf3e56921a554d76fd1157f6b SHA-256: d269c3c08b678ee0c022b623a8338d1f5ce882cf18dcbe4c300321c68f562cb1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://nipisod.ru/strik?utm_term=miriam+truman+capote+full+text PDF link annotation
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/4b053bd205e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_605f9e9ef3429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_6061dee5967b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_6011fb38a9f80.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/act_cabs_book_online.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/7658460.pdfIn PDF document text
    • https://fuvukajewub.weebly.com/uploads/1/3/3/9/133999399/devemarokuzafik_megiwesugaxik_bemufujol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_606bfd0b296c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_60297e18df1e5.pdfIn PDF document text
    • https://luketekovagitor.weebly.com/uploads/1/3/4/2/134236109/1989847.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/carta_bioclimatica.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/6034479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_603c8520f06a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limuzer.atwebpages.com/agnes_martin_lugand_une_evidence_gratuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbf89b3-14eb-463b-af2a-3facfe2b0eb1/kutivugug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e3d550-2b30-4392-a403-93aa62d33ffa/72929073248.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_d9494bc6993f43df9bcb6e56cd39c1af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4300700d-827f-41d3-bc68-871341ce937c/the_white_princess_book_summary.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/how_to_reset_lg_top_loader_washing_machine.pdfIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_1e8b812ab7dd41d9ae22f46fc6b4b883.pdf?index=trueIn 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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 5056 bytes
SHA-256: 7acf2416edd1d145149d0aa4c1e2a8c20061c61c894e5314f1265434b8594d53
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 11096 bytes
SHA-256: 71d10677981f08b03716299276388a68106e8050c46ba656cc17458e1cca5745

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