Malicious PDF — malware analysis report

Static analysis result for SHA-256 9044dbc04f57b8f8…

MALICIOUS

PDF

76.2 KB Created: 2021-04-09 13:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57315f445628ea64a594582b2a538437 SHA-1: 0942447de3885ba409c0151ea8a98e9a10e7823e SHA-256: 9044dbc04f57b8f8fa164cdcb71ad811d9c84c4d9059287abd0a927a31435dab
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what+is+the+moral+lesson+of+the+story+cupid+and+psyche PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/why_is_my_wireless_mic_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8215a563-ac87-40c9-a2a7-55c7b7a70245/descriptive_words_for_writing_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f475b348-8209-4809-bc33-69468a321937/mejores_frases_de_el_amor_en_los_tiempos_del_colera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f5f5f7-ea7e-4422-a152-62d620036da4/10955447469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f7b604-a44c-4a65-b18e-29d457041768/fajoxidiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56db9a56-c5b4-482d-8f87-4b3062476fcc/jizizibiz.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_f7e69c01d0aa446ca46f6a9d8a326297.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/91501217910.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_7e06678b82bf40e6b732e8bc98227c19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/35091171167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440654a3-9b2e-492f-83e3-cc1d983433a3/synthesis_essay_outline_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e68d68-de5f-4ad1-94f4-1be8224da9e4/25975506244.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/acer_aspire_one_cloudbook_11_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30153989-1820-451b-a6e8-da3f728a810b/how_to_fit_overhead_door_closer.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_dfdc3efc714b438a8df0ae6733e4d41c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3438599d-79f9-4e35-b448-e25858748ba4/limites_infinito_menos_infinito_ejercicios_resueltos.pdfIn PDF document text
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_63569c444da44b1a933a2ff96e0ad64d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36a6166-0e7e-4346-8b23-5d676d9918e4/38023998046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a1bf45-fdbb-46f2-8273-8bc0675b56ba/dejadujizuwibit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f501880c-57fc-4ac7-9a68-f739e5b911f9/epson_3020_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76acfae7-9c87-4dc2-89de-b051a1c8f21e/siguzijevuwiginomagadum.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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 5508 bytes
SHA-256: e59ac9de1ddcb1796073b4b508a53a6fac26b8ea18b2e70a4bd7d05a3f932009
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 10976 bytes
SHA-256: 7b9cb369f1b199f0d43f190da1e048cd3349acfd5c14b61ef6460e3a0e376f8e

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