Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb19b62ef37fd31…

MALICIOUS

PDF

76.3 KB Created: 2021-03-15 15:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8b5da74324421625fb26feda9fed50d7 SHA-1: 52e5249499e33eb72b49ec31a37c19fd980c7280 SHA-256: 2cb19b62ef37fd31b375e661b000c8e12b157e8a4983a64a8512fdfd00d9a28d
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://midufefew.ru/award?keyword=ejercicios+para+aprender+a+leer+y+escribir+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufezexu.epizy.com/50361475331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2247eac4-9a80-497f-9813-a9769abe8768/what_can_you_eat_on_daniels_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ecef5b-ebf4-4adb-a832-8fd2ee0f3ee0/68910338532.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_a8184149b10f4998b90c35bf4094269c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a52e30-bc68-4fcc-a0c2-80c30c8614db/the_knowledge_of_the_holy_tozer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd276a0-32e0-4976-bb4a-b3a9180a70c7/life_without_education_paragraph.pdfIn PDF document text
    • http://bavosezema.epizy.com/91825212846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267faa18-dc3d-4763-83b8-a236d56d0459/bokobawujazujoduzoxik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9b4732-4c3d-4d92-8b76-5facfc20d057/definicion_de_derechos_humanos_segun_diferentes_autores.pdfIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_e46e50cd917a465692f249c42600525c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ca7631-b81a-4b29-b23e-ce9494332e52/79074642749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853caa3b-068d-4cbc-a8d3-abe7982eecac/how_do_i_create_a_rental_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5092e2-cc31-49dd-9e88-1d41e602701a/needful_things_store.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_95aaf0f666d34ff58a307878499c8a6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/111ff45a-0ab2-479c-b9f2-e15dfc6b839e/what_is_the_tone_of_the_poem_dreams_by_langston_hughes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596deb4a-be64-418f-afac-2e2d324304a9/is_health_central_reliable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888e8b94-4a86-4669-837d-aab2df4cf0d6/how_do_you_get_legally_married_in_las_vegas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9602bf01-3b6a-45b3-b069-6623881c3805/general_data_protection_regulation_2018_in_early_years.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acedfab7-0b89-4b57-ba30-8d7d169ca752/ikea_queen_bed_frame_dark_brown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d93bd12a-5b80-4d2c-8a0a-43101c8c413f/vamajagu.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_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 5424 bytes
SHA-256: 2e8039155817b5b4c0cd8b34f918674d09c12ac01f9c712acd2ff2adabb4a7f6
font_01_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 11820 bytes
SHA-256: b6d2a85dbd207536ea45957752edecdd8fe92e0677d11878a80df700bf2ffd95

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