Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced9ed1ccda94420…

MALICIOUS

PDF

83.2 KB Created: 2021-03-07 21:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c6d900f4c05267d2fe60a70b6784f8ff SHA-1: 81690c1f8d9244db177df59a7f1572c6fa812947 SHA-256: ced9ed1ccda944207689ad700e0a211268cefd4b0d3a01472358456813f46246
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'https://kuzutuzo.ru/wix?keyword=how+to+modify+footnote+text+style+word+2016', are likely part of this scheme to drive traffic to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=how+to+modify+footnote+text+style+word+2016 PDF link annotation
    • https://kibowoje.weebly.com/uploads/1/3/0/7/130775027/cb0f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/redixebu/ahe0Lgh/weather_forecast_for_today_in_philadelphia.pdfIn PDF document text
    • https://potelukizul.weebly.com/uploads/1/3/5/9/135961045/jujogidose.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/TTicQo7/pool_billiards_pro_apkmirror.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/njfqibC/overkill_s_the_walking_dead_ps4_price.pdfIn PDF document text
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/9f9cb275c.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/baxuvatiromaxapugenegil.pdfIn PDF document text
    • https://givosusomab.weebly.com/uploads/1/3/5/3/135349573/7b161880283.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/what_is_the_message_of_christmas_carol.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/de4a45ef8e1.pdfIn PDF document text
    • https://kegebexik.weebly.com/uploads/1/3/4/5/134590944/benuvesemejiwej_nizosomi_mekorawat_vagem.pdfIn PDF document text
    • https://vufaredagisab.weebly.com/uploads/1/3/4/5/134585575/2e2410ffe9d90e.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/02ee3b54ee2a0.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/CgfNieD/lost_in_paris_catacombs_video.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/FrPIyhh/13901034600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teropisarazo.myartsonline.com/68485847528.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/can_you_buy_penny_stocks_on_robinhood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfced132-66ae-45d7-a6cb-d66718a0b277/amazon_kindle_d00901_reset_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf45296-c875-41e0-a89c-cde4b58a431e/third_estate_french_revolution_definition.pdfIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/mowolokekizopabilul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29618efb-ae98-4840-a543-36d3602ec68b/how_to_become_a_computer_hardware_technician.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7931db27-ac3c-4654-9684-7c33890ac1e6/fiwevavigekule.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 3924 bytes
SHA-256: 7336beb570a4d9aa6424c7320d7b4d4e7bc2ac6540aede2ce1c482bc8a395ac0
font_01_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 5544 bytes
SHA-256: d53f06d79686388fae1f028bdcbf8d774c81ab4f4fea395baa43650c5d791466
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 10392 bytes
SHA-256: 059bd40fd20c19ec955dd0c7ad6c381ba3dab1a48eddaa3a3ea5776507598a47