Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a17eb253e29c05…

MALICIOUS

PDF

79.3 KB Created: 2021-03-23 03:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ad5fa225c91e9d3fe386897f9b018fd9 SHA-1: 5b57abfabffebfec04e421bae3127711dd9bc599 SHA-256: c8a17eb253e29c0573479cbfed2b01da837e61a29ccc63ceff117c320c95b2f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/award?keyword=dosis+anti+tetanus+serum+pdf PDF link annotation
    • http://tajoraf.22web.org/bank_cfo_interview_questions_and_answers.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/best_java_books_for_beginners.pdfIn PDF document text
    • http://alsamcctv.com/19090643188cuw4j.pdfIn PDF document text
    • http://connexion-amelii.xyz/ms_7778_ver_1.0_motherboard_drivers_downloadkczar.pdfIn PDF document text
    • http://siondez.ru/baby_monitor_with_phone_app_and_screenydz3c.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/pidetenagifejibaxaluko.pdfIn PDF document text
    • http://1-bog.ru/soveve2bjz5.pdfIn PDF document text
    • http://fupofejoja.22web.org/mativupalaweviket.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/jnv_registration_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujavajivedejin.rf.gd/vuzadalalerogaxegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075d7d1e-c7ef-4c8b-bf7e-af8fda6774b8/18737454248.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_fccb766b558f4f3ba928e04bf93cf724.pdf?index=trueIn PDF document text
    • http://pefimubis.myartsonline.com/vidof.pdfIn PDF document text
    • http://kenavegolixase.epizy.com/3_different_types_of_memory_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1e6320-2e2b-4124-8825-2e1ead916616/o_diagrama_de_fases_ferro-carbono.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_66be8ce5a8794823a484722af30f7c4c.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_d639c02ffe034966a3765c38cb7727e7.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_feb262fa242942098960985591a3ca59.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_f66f0ec81ef147f09ecbd231d6db4e80.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_fd8a8d2857a24784a921adad6ff0dc04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcaa8b8b-dd81-4780-a3d7-8d2c0d3512da/61809684911.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_271c2b9ae74d4214a12f7abd398403f2.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_fbf72673db57478f9a29ebb1ecc8b224.pdf?index=trueIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/38205770205.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_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 5152 bytes
SHA-256: d2149712de45fd32189fb474ab2a2d313921ad74c4cbd6c1dac8162d56890e93
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 10884 bytes
SHA-256: 60f58d71b2053ca643313b80aab077caa157bfd44e65ddf720378f9ba80e3d58