Malicious PDF — malware analysis report

Static analysis result for SHA-256 94373ea0a4d6d09e…

MALICIOUS

PDF

84.0 KB Created: 2021-03-13 21:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a064d84fa0dafc6b32bc3061b87d87e3 SHA-1: b0080c4d94762805ebdd012321fa635cf4c6dba1 SHA-256: 94373ea0a4d6d09ec7c9969c2d452cf5910ecf4232e034453de38977a167e66d
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a potential for directing users to malicious content or phishing sites.

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://golowaki.ru/award?keyword=ncert+biology+class+12+pdf+in+english PDF link annotation
    • https://potisejomi.weebly.com/uploads/1/3/6/0/136092970/nijibedewofodop.pdfIn PDF document text
    • http://detonic-de.website/41599763880lfd9r.pdfIn PDF document text
    • http://ravevuzovije.mywebcommunity.org/63955312995.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/a_que_se_debe_el_dolor_en_la_espalda.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/jelolikemonoveban.pdfIn PDF document text
    • http://crawlmqyu.space/conditional_statement_worksheet_with_answersvf0is.pdfIn PDF document text
    • https://kemovovem.weebly.com/uploads/1/3/1/4/131408999/23593.pdfIn PDF document text
    • https://gavofazipog.weebly.com/uploads/1/3/3/9/133999173/a3c3a20106be.pdfIn PDF document text
    • https://lebilelumebik.weebly.com/uploads/1/3/1/6/131636833/5a17937.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/40704480597.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/764f5701-ab0d-4789-92a6-44f5af0e893d/vizio_e231-b1_remote_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d9e3a3-d33b-4d8e-bfd9-8f383381a81f/pedeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12f520e-75db-4d1c-9ac6-0497cd93f78e/gegufaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bc5ea4-e3ee-4999-9650-7d57cd553854/bertrand_russell_quotes_fools_and_fanatics.pdfIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_bfdf1383fb0046e4b631462c906a0b25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/badc6618-439a-48fc-9a5f-293a1e9c4fa6/bram_stokers_dracula_cast_of_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40cb714-82d4-4bb3-96e0-2e999acf4dd5/39611868880.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_b1d45e3f36ff4566a3a39e51dab251a0.pdf?index=trueIn PDF document text
    • http://sabiwilurase.atwebpages.com/ancient_civilizations_map_activity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ec9073-afe2-4eb9-b562-d309cd35f8bf/samsung_galaxy_tab_a_8.0_t350_book_cover_case.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 5812 bytes
SHA-256: 2ad82445f3f29348360232e48818b3fcb0105f819d594559e28ebb9d63dcf65b
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 10896 bytes
SHA-256: cdde74090d6a93df686f2c2a0d015ec0225d7be4321c35b81d67b57df8158235
font_02_sfnt_off00012cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 16096 bytes
SHA-256: 4a4ba2916cbb77a4560e469f3199d6e84ec5cea7a529ccdf4999d6eae28de042