Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2839654c2c61a1…

MALICIOUS

PDF

93.4 KB Created: 2021-03-17 04:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9528b42eb92b75562e443f0210d48619 SHA-1: ac9241c067896eb96730d6054727bb70e19a505d SHA-256: 5d2839654c2c61a1a8cc6934f0a0875cdc91594c6c41a32eb65595ce53c2bc50
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic further support this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=cuddeback+attack+ir+manual
    • http://lavorunolutoga.22web.org/snake_pass_pc_game_free.pdf
    • http://uplrezina.site/2012_jeep_grand_cherokee_overland_headlight_bulbsta78r.pdf
    • http://straponartist.com/nirawegopamumipinakiraievom.pdf
    • http://studyweb.site/how_to_reset_cartridge_epsondp7y7.pdf
    • http://rejobumutoge.22web.org/radiloretubufoxiwumarabi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_21254ab01a9f48929f232bbbe631547e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e5c3014-d025-4089-b71f-8aaab5496a52/naviniwojosokawikolixub.pdf
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_af3e0256fbe64b0ba7d607212f335c1f.pdf?index=true
    • http://zoguwazor.epizy.com/dedegigizadimesafita.pdf
    • https://uploads.strikinglycdn.com/files/cf991340-6b84-45a6-a962-1e28b63d4a32/858526512.pdf
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_2771402fef59435e8828e27a4818ecbd.pdf?index=true
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_41a21555f1f94e6599a6d22b2b2e6001.pdf?index=true
    • http://betiwewis.rf.gd/executive_summary_template_business_plan.pdf
    • https://uploads.strikinglycdn.com/files/16d0309c-0565-46ea-b6b2-74928b2abb1a/excellence_resorts_punta_cana_vs_el_carmen.pdf
    • http://zavufomagug.rf.gd/electrical_safety_training_system_answers.pdf
    • http://golukotekitu.epizy.com/etapas_de_la_auditoria_de_estados_financieros.pdf
    • http://fumadasiturati.epizy.com/autodwg_to_dwg_converter_registration_code.pdf
    • https://uploads.strikinglycdn.com/files/d17a0cbd-a009-43d7-bc34-a3b54b46016b/char_broil_grill2go.pdf
    • http://kijakina.epizy.com/what_did_theseus_do_after_killing_the_minotaur.pdf
    • https://uploads.strikinglycdn.com/files/696e7797-cafc-4feb-8097-eec087109063/66963350094.pdf
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_ebb7faee076446d6b8af9b35e8f35c8d.pdf?index=true
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_3d67dcb8b1d149129a7546733da0051f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001100e.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 2828 bytes
font_01_sfnt_off00011a08.bin
794c340554d619c0ebd750c04e8e03e58640de4ff8ab7136e5b131e7aedd999a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 5016 bytes
font_02_sfnt_off00012afb.bin
ff28508b8d7ded5836f9ef5e4c423bb93080dd3b3684146a271b8c625df2bb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 10112 bytes
font_03_sfnt_off00014d7b.bin
71b4a4971c0bbbbe4d6d34998d2891e9ffacb07ef545efde6754ae3d566c9d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7B 16936 bytes

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