Malicious PDF — malware analysis report

Static analysis result for SHA-256 57697c367c08abe7…

MALICIOUS

PDF

90.8 KB Created: 2021-06-10 10:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f2906b1db8cc1817dc0ce2f84f7f3db7 SHA-1: 9e3bd751b3a8a77bcc5f5d2147e73e89ee80a942 SHA-256: 57697c367c08abe7c373d47f6428c0c2d012a9bc6c5cf24da56c4ef7d48ae6fa
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/pbw?utm_term=class+12+accountancy+book+pdf+download PDF link annotation
    • https://pazelofigo.weebly.com/uploads/1/3/4/5/134588761/e5aba.pdfIn PDF document text
    • https://mapadubedebo.weebly.com/uploads/1/3/6/0/136095435/834660.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/20825664520.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/raruv.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/8e2f4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7929796b-5843-4f68-af27-014939d91037/what_happens_to_a_pimple_after_you_pop_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4693517-915a-4a81-b1e9-70eb401ae17b/ejercicios_cifras_significativas_y_redondeo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4eebb75-f7a7-45fa-9804-f9759a26a16c/44905982517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a708f117-2f40-4c9a-a4f6-9888e78ae35b/vocabulary_workshop_level_c_unit_5_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd2c643-24aa-4c7d-9d10-78fd62bdeaaa/lista_de_exercicios_sobre_numeros_naturais_6_ano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bbcb41-6427-4765-bf81-451cd6c50b5a/58344095296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b629bf1-19d0-4d85-b4c7-c4695ca80fb0/cambiar_tipo_sistema_archivos_raw_fat32.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/f/emotional_intelligence_daniel_goleman_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69de55c6-013d-418b-9aad-5695977de3c5/how_to_get_alight_motion_pro_for_free_iphone.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144475473/56423735964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e515fb7-0254-4fed-933a-a1ef88f7d393/air_force_one_full_movie_netflix.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144761739/rupatobakavepasivipar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbee531b-5b76-4ed3-b976-7e01c8601f7b/rarotoguwojusitumemimesum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08054ee5-6533-4ec0-8391-176d0d0481a5/webekimidaneruwodawat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091da714-057d-4da3-8232-a0b4fd564d88/bevutufutex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e11d59b-a72e-448a-aed2-136ca1cd24e5/how_much_does_it_cost_to_study_photography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb822e6-ffc4-4a58-bcba-d2a8bef28a43/nuwuzobareripu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d43a881-a7c9-4be3-828e-8b5311399674/did_anyone_die_in_the_lynyrd_skynyrd_plane_crash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51146f36-1d1c-4f73-8992-6c975e650a9e/97484730178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce982247-681b-4398-bf11-9320780ffabd/16565373384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4dbf06-b65f-4f1e-9610-c0777545dc6c/45468329074.pdfIn PDF document text
    • http://tijigika.pbworks.com/f/pawarepifovezeda.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_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 5376 bytes
SHA-256: 71c15dc98f3187b895ba88f8e109b8e426e7997a4b4ddc134536a841c6d5bb92
font_01_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 10932 bytes
SHA-256: 45f940fbcbde9851b277b58dd964e460bec85062c214f0f5408804e40a01e9d1
font_02_sfnt_off00014e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230