Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b54bf527aacf5cd…

MALICIOUS

PDF

74.9 KB Created: 2021-04-30 09:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 746a6b03b0a3647af210dd6f02e17353 SHA-1: 76c4efdc4c1959edf2ec84027c3e9480eefe7c6e SHA-256: 8b54bf527aacf5cda77ea496cd76e940b1b86d93afb1aaedbfdc5e082ce6312c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=kirby+heritage+vacuum+bags PDF link annotation
    • https://gitumakiwu.weebly.com/uploads/1/3/1/4/131437138/najonuvewapodilom.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/muzowotab-xexumegotepaxo.pdfIn PDF document text
    • http://sentytld.online/spectacle_island_fallout_4_can_t_use_workshopsu4jq.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/2485411.pdfIn PDF document text
    • http://lightly.store/647897891552r08i.pdfIn PDF document text
    • http://securityverifiedservices.com/79447072429mtnq0.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/zasaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vufupu/world_map_with_oceans_and_continents_labeled.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_de2c0768f6e74e1fba9cd1523ed39a09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/vufanakafopukub.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_22c188be2a58417888994489b591f0d1.pdf?index=trueIn PDF document text
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_df9976d4fd5e4658acb75bf8800b3e67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/46453270898.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/blocky_cars_online_mod_apk_ios.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_9810e3d6405e41d3bcc69aaf088eb6a6.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_71a6a33cd5f7404f9f693957366c5f7b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/nfl_week_7_printable_pool_sheet.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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 5452 bytes
SHA-256: f6ac844745a577f74061dc4f6aef1c6b5f3edc65633301450cb79b226eb6216b
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 11260 bytes
SHA-256: 4ffcec39d070a5184d4125b2d49375d62e4963f00e9d461a6aac8f368e210690

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