Malicious PDF — malware analysis report

Static analysis result for SHA-256 f989c818326f30bc…

MALICIOUS

PDF

71.2 KB Created: 2021-05-30 03:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 90a6910556b1d9d20c3545a04daa951b SHA-1: efc8ffde732ee78d2e074703fd19a0abcd3936d0 SHA-256: f989c818326f30bc762a76f80534e9fd973c8aa52546712f593aac726bf1e17a
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=cuadernillos+de+s%25C3%25ADlabas+trabadas+pdf PDF link annotation
    • https://dasifapuzo.weebly.com/uploads/1/3/1/4/131454731/pagukimexuvuber.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496146/normal_5ff5be287b900.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/5230c6e9e90d.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/jatuxodamuli.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/xutereda-gatug.pdfIn PDF document text
    • https://juwabizaf.weebly.com/uploads/1/3/0/9/130969053/1729987.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/bumilexik.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485443/normal_60b07f50067f6.pdfIn PDF document text
    • https://kosazuritejozu.weebly.com/uploads/1/3/0/8/130874521/534288.pdfIn PDF document text
    • https://jutineriru.weebly.com/uploads/1/3/4/8/134866815/5451183.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/3419994.pdfIn PDF document text
    • https://rurasudi.weebly.com/uploads/1/3/4/4/134485231/gejuzovonej.pdfIn PDF document text
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/kogune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_601aac942c6ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83242588-b0db-42c9-b8c6-af8ec83deb91/how_to_play_shuffleboard_outside.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae50ee66-d6d1-4b26-a684-f13485c49ec1/how_much_does_a_new_crown_cost_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e750dea-11f2-4dc3-a400-941bf6224d56/the_go-giver_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9da0f6-363f-4fce-89c1-1d6bd09f20c1/how_to_draw_a_gun_easy_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083310f3-3649-4bdd-91ca-36e7dbb35579/cien_aos_de_soledad_resumen_cap_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd058d1a-4104-4501-bc53-83eae7294fd7/kiinde_kozii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0602c88a-68fc-4267-bb0d-5b4190e211fc/11791232168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86fd899-8d08-47ea-bf07-2a3648bd78c3/ccna_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21ebb91-41db-4dbf-ba3f-fa02fb20fc6d/wubelebupasilakijajufepu.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_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 5136 bytes
SHA-256: e91f38973be288826128c4984d0dfe023c59ca9bcef8af3d673a7ab251db04ac
font_01_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 11660 bytes
SHA-256: b317d0fa26866d3cef3f315784f93aacef85a9088bcf0c7c8200f37d7704e908