Malicious PDF — malware analysis report

Static analysis result for SHA-256 900f8c7a88c727d3…

MALICIOUS

PDF

80.5 KB Created: 2021-03-20 03:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 091473dff7828ea8b05c12f56981d1ae SHA-1: 9950706843b42e04ae10502603f4282a6fce060b SHA-256: 900f8c7a88c727d37bf21031a0a17d33598148f2e0938260b565e62e36c9c786
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

Heuristics 4

  • 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://jacksth.ru/123?utm_term=android+browser+clear+history+back+button PDF link annotation
    • https://jodatonibidoxej.weebly.com/uploads/1/3/5/2/135297120/9eb7ec.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/xoxel.pdfIn PDF document text
    • https://ditaziretuviki.weebly.com/uploads/1/3/0/8/130874055/sinajefufu_pofubilifumegap.pdfIn PDF document text
    • http://mugeziv.22web.org/38442702994.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/pezapumewirinomo.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/gfQhihP/no_man_s_sky_vr_controls_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/neganobasiwe/hgifKhf/computer_hardware_fundamentals.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/78489160355.pdfIn PDF document text
    • https://zadilomevesijob.weebly.com/uploads/1/3/4/5/134581884/kulebugog.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/23580169122.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/waxegatulo/jodewosuzigim.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/adobe_acrobat_7._0_professional_setup.pdfIn PDF document text
    • http://lojibovel.myartsonline.com/soviwire.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/53956676949.pdfIn PDF document text
    • http://nexopuvesoreben.epizy.com/maths_book_class_4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/certified_ethical_hacker_course_material.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/81658638138.pdfIn PDF document text
    • http://kivekogifix.epizy.com/pizelebe.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/diy_aeroponics.pdfIn PDF document text
    • http://tulakitukubipi.epizy.com/2381668025.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/birds_images_with_names.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/livre_pour_apprendre_l_italien_gratuit.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_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 5412 bytes
SHA-256: a5d939c7c46d587ad9893b90cff494d5ed0783a61fbef3696869ab44e19104fa
font_01_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 10996 bytes
SHA-256: 93e265db67f7e62db790e2fe43ff37375f60e6efa9733d19842c3ccaba1ce28e