Malicious PDF — malware analysis report

Static analysis result for SHA-256 508d8952f04ad737…

MALICIOUS

PDF

80.3 KB Created: 2021-04-07 13:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7ef5bf951fc8271c426871bbd46d78a7 SHA-1: 233f2b2546362cdcb9b5f7a692eb327faffaaceb SHA-256: 508d8952f04ad73787983e111fcb85e34da6e78788d6ad47fbf1deb944632270
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one pointing to 'seumenha.ru', suggesting a potential phishing lure or SEO spam campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent to redirect users to potentially harmful sites.

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://seumenha.ru/123?utm_term=design+resume+template+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471234/normal_601753400f592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_6023fe83a1600.pdfIn PDF document text
    • https://milanabez.weebly.com/uploads/1/3/2/6/132695465/91cdf.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/54ccf4a.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/7a3c66a7-e86f-4b33-9705-572cdb00806f/toyota_tis_techstream_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf9e0a2-9cc7-427c-b429-cb1ad207398e/zudarutajurexotuxibabox.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/level_one_antiterrorism_training_answers.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_7095eae93b4f4e7d8d3d60b029bf5995.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/que_es_un_acuerdo_en_derecho_procesal_civil.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/ode_to_joy_double_bass_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/28854230074.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/why_is_my_hp_printer_not_printing_colour.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_808c6003fcb842cb966c45e9654d601a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9076c973-ab04-4eb7-bf91-6280ba97a76b/deadlands_reloaded_players_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/autodesk_free_3ds_max.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/97056778723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39f7a23-951d-4232-946b-b02cc6b75322/toyota_production_system_14_principles.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_e5edff0eb2e244e2be60393c773cebda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/71884161191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37481c5f-a6dd-4e19-8ecd-91d9d66672e3/who_was_in_mary_poppins_returns_from_the_original_cast.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_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 5368 bytes
SHA-256: b8ac2357e5d9f488ae19323a624558fc2ee1fa409fa9b41d9971f4b134e337a9
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 10356 bytes
SHA-256: 46f9e1cc8ec0fa0f144a1ad5fba397503b147f196e8910ba0beb983910556b62

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