Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64ea237b1b70eea…

MALICIOUS

PDF

79.9 KB Created: 2021-03-13 21:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dd4662f9e51becb7a5dd7803354f6a6a SHA-1: 94281516d26a056124bedcf9269cf11209822cce SHA-256: a64ea237b1b70eea6a3363b57a56d8163b85c1f4cedc25abe0771586d83695a3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to phishing or malware distribution sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/123?utm_term=missguided+playboy+bunny PDF link annotation
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/6292275.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/xojixuxidovazona.pdfIn PDF document text
    • http://tokio-2020.fun/maxwell_leadership_biblexhf8e.pdfIn PDF document text
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/sobomuse-pobos-rufotil.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/1488466.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/1517786.pdfIn PDF document text
    • http://lngcliente.com/how_to_use_ravpower_chargerdx7qq.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/dezorijup-fogubojuxasob-moxevili.pdfIn PDF document text
    • http://silkhfig.bid/69064451373yvurj.pdfIn PDF document text
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/90a5e8962b26.pdfIn PDF document text
    • https://sesoguxanijiba.weebly.com/uploads/1/3/5/3/135309487/wibave.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/d3c10f74686.pdfIn PDF document text
    • http://erogan24.website/paypal_stock_price_historymo389.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/4768703.pdfIn PDF document text
    • https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/db2d9b49.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/business_plan_for_partnership_firm_project.pdfIn PDF document text
    • https://wozexofinudere.weebly.com/uploads/1/3/5/9/135984457/e837bf57.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/3ac11eb0-c52a-4388-8999-5c86543e4a73/english_grammar_exercises_prepositions_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37ae393-145a-4265-8c7f-27b5fbe9eb7c/pasolilujoxigepeziputi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436b3e0e-aa15-4e35-9297-2fe907b8cd8f/16104606676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6de2ee6-ea46-4c26-b6ec-e20a9364952d/how_to_help_non_readers_to_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141ae2df-a53c-4b9b-bf15-fd82c33503d0/bionic_turtle_frm_practice_questions.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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 5080 bytes
SHA-256: 449604df2744f8ed3ca87d0cdcf08e1b30b7a602e90a3220e420472af72e2e69
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 11460 bytes
SHA-256: 0df8e2cce715a160137205c11c965eed1a804da8f4147bf50df1ba3cd99d13cd
font_02_sfnt_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c