Malicious PDF — malware analysis report

Static analysis result for SHA-256 a847a0b11845dee7…

MALICIOUS

PDF

85.5 KB Created: 2021-04-17 21:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a15811bc7a3b504b68523c444b430b4 SHA-1: 50e62a78aea630146e39d58010175ab9d9908e86 SHA-256: a847a0b11845dee74749aec83f5e6460b5e9897d27d0b972418b9eedc6cb38f4
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 0.9995

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://kuzutuzo.ru/strik?utm_term=what+age+is+a+milestone PDF link annotation
    • https://pidufemimin.weebly.com/uploads/1/3/6/0/136054052/litovusaxa-boruzopinewoje-xeseputuginuj-gelape.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/puserun.pdfIn PDF document text
    • https://gijesilikisuzid.weebly.com/uploads/1/3/2/6/132683000/japuzogog.pdfIn PDF document text
    • https://kodidenub.weebly.com/uploads/1/3/4/3/134328035/5078998.pdfIn PDF document text
    • https://bituxomixa.weebly.com/uploads/1/3/4/1/134131270/334defb516dd66e.pdfIn PDF document text
    • https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/4584674.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/80d94e.pdfIn PDF document text
    • http://mewanomape.iblogger.org/kakogo.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/noduxidusedidoroz.pdfIn PDF document text
    • https://gipazekafasulal.weebly.com/uploads/1/3/4/6/134600210/tejiwemixa.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/74c4520b-2560-43f5-a7c3-ff836eb64e94/ccgps_coordinate_algebra_unit_1_relationships_among_quantities_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a93113-7507-4dd9-a295-728967234e9b/area_formulas_trapezoid.pdfIn PDF document text
    • http://sexililelaweru.rf.gd/69101574759.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_4f79817788e5457da43732c4fa802be8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aac190b-bd22-4846-ae3c-708545c2a378/pepuzoterugajufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1662c64-bed9-4360-afec-ff1c2e86f8f2/the_zookeepers_wife_full_movie_download_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c867acbd-c9c9-470d-a902-2fa3ff6a1d5e/q-see_ip_camera_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9116ab70-e5a5-493e-9f4e-92c72e9525c1/the_revenant_book_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a633c4-2e2a-4426-98ef-164b27e56af0/troy_bilt_push_mower_with_honda_engine_reviews.pdfIn PDF document text
    • http://jafolavigej.rf.gd/wubew.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_82b3f586bb974da9846344f6fa85fe71.pdf?index=trueIn PDF document text
    • http://dexedigobejo.rf.gd/burger_king_breakfast_burrito_nutrition_facts.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_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 5016 bytes
SHA-256: f6c4c0b696b67f38b32b5b1d11b6f77176df72b7801af6de8ec7f149a3b4780b
font_01_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 11288 bytes
SHA-256: d61ee02ae2c442978a6e58372300b316dacd17d5fb43246711af37443586fbbc