Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eef6cdef583e764…

MALICIOUS

PDF

82.6 KB Created: 2021-04-05 00:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 97d3fce6cd96022aa4cdafaa7283b572 SHA-1: 1dd76d41c7afc6c9bf62840aec58675ed77be653 SHA-256: 7eef6cdef583e7648ac8e1269547fcf13e03d2445394a89d7efaf8b29f12536a
186 Risk Score

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 0.9964

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://nipisod.ru/strik?utm_term=how+to+size+a+central+air+conditioner PDF link annotation
    • http://slimerecipe.org/multivariate_statistical_results83x0i.pdfIn PDF document text
    • https://barosowuni.weebly.com/uploads/1/3/1/3/131398377/dukimu.pdfIn PDF document text
    • http://meetsoda.club/jukifqyshz.pdfIn PDF document text
    • http://kefikajutadab.22web.org/bagrid_catfish.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/811012f1b1afd.pdfIn PDF document text
    • https://kukiramofup.weebly.com/uploads/1/3/1/4/131413837/leretafibu_kujotibu_gijuduvun.pdfIn PDF document text
    • http://profibrend.ru/algebra_de_baldor_ejercicio_106_resuelto_con_procesoktsh6.pdfIn PDF document text
    • http://freud.icu/94686963791titlu.pdfIn PDF document text
    • http://zesamoa.online/batetafipejajojizawubesuy8rxf.pdfIn PDF document text
    • https://zolujalu.weebly.com/uploads/1/3/1/8/131856956/jekesefureber-paraz.pdfIn PDF document text
    • https://vikakexotokipo.weebly.com/uploads/1/3/0/9/130969200/0476d919a2173e.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/bfc68f.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/jaxobotemomiweka.pdfIn PDF document text
    • https://rutelixiriselop.weebly.com/uploads/1/3/4/7/134748314/jipizibinedi.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/00fcdf225.pdfIn PDF document text
    • https://vabisoxapulaji.weebly.com/uploads/1/3/4/4/134444495/vupojupowexowivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwosidomenab.rf.gd/fusionner_deux_documents.pdfIn PDF document text
    • http://xifenarubomes.rf.gd/duxawiwogosomikudu.pdfIn PDF document text
    • http://vomusisoz.epizy.com/articulos_cientificos_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a7aa60-f88c-4c5b-b4c0-16cfe128fd0c/rowenta_steamforce_iron_warranty.pdfIn PDF document text
    • http://kolofagigetu.epizy.com/thai_heart_failure_guideline_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da522a1-518c-4934-9106-e706fc56f961/kotug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2ed34f-2f22-4a71-bd29-12ebf5265f90/2.6_limits_at_infinity_horizontal_asymptotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b8abc3-3fe4-454e-8eb1-6e5f90ce2c31/how_many_calories_are_in_a_starbucks_matcha_green_tea_frappuccino.pdfIn PDF document text
    • http://zewixezix.epizy.com/android_device_manager_google_online.pdfIn PDF document text
    • http://fusiwati.epizy.com/varanasi_master_plan_2020.pdfIn PDF document text
    • http://judutuv.epizy.com/lexile_level_chart_7th_grade.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_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 5036 bytes
SHA-256: 715fe0bab1ef9660c5f1347bed82ff4e71a50b32f1d5eae6f8f02f65f3a30593
font_01_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 11044 bytes
SHA-256: d952d698bae79d362b58626c8d8fc8544d74debe47c23fc66d458fefce001bfa