Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b2826dd529fcf7…

MALICIOUS

PDF

83.4 KB Created: 2021-03-30 19:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 66b7f41afe6cc0699db041e597f04ad6 SHA-1: 925c81ed8029851cdce782ba290c140c951e6fa2 SHA-256: d4b2826dd529fcf7106df9a020a990b1b326a46ee29a68f222eaad95eabdfd2c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=when+rocks+cry+out+horace+butler+pdf PDF link annotation
    • http://wuxetij.mypressonline.com/generos_discursivos_tipos.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/47303932040.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/ags_beers_criteria_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_868380a7b45f492c8d711b5636659c14.pdf?index=trueIn PDF document text
    • https://db6d3479-2aeb-4a59-914c-1f55c48648c8.filesusr.com/ugd/9f5433_970f3d5144de4c69a0f4f1d1701c0612.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_3c71c3e3a8e5471eb45095e1ce32a266.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_9598c431c2a04dd6801bd26e45a163ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de5a95c-f474-460f-b7ee-6fde721a58af/56792077539.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/how_to_pair_remote_with_tv.pdfIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_4671f167cbc94bd0a5b78d45177200a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zopenave/76979618304.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/levonunazakigiw.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/apc_smt1500nc_smart-ups_1500va_lcd_120v_with_network_card.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_e9610b953d0943029fe2d250c545177c.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_57f4e9944e4d4729a89755bb4c2b3913.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/multiplying_and_dividing_fractions_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/14925416331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd383da9-97e7-4721-b4a3-41d487e37e66/plural_or_possessive_nouns_worksheet_answers.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_dcd547fc8e7046ff88cb05869d0e6178.pdf?index=trueIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_54baea1f058e435081361b89128b8b77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25107a82-ad23-427d-a2ae-d1be500b75a4/aprendizaje_basado_en_proyectos_ejemplos_secundaria_ingls.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_78f5885094ff4bc78cb49b81641bfd32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/cif_cream_cleaner_data_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d718d689-2730-42cb-8abf-bcec46129677/40200504325.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/40843225276.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/mixabidafarozu.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_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 5564 bytes
SHA-256: e054f6fe3616f7317c4858221ff217620f0136c9709b335a3240d3daa4df20b0
font_01_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 11376 bytes
SHA-256: 66e726ec5b4d7db7938d4fc7a74f9e3c15be8efab082328e23bf9157500a4b5a