Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9f65ac56ad7923…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 08:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 422c90000d26f3f22ca0ea8cea7f1cd6 SHA-1: 9d782e307756b289a6e8ff08fe763e7bc0ead9ce SHA-256: ea9f65ac56ad7923203bee36968fc0463d7e49ad8adf155c5aa34eeeef9292b1
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 0.9996

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://druttle.ru/wix?keyword=have+a+new+kid+by+friday+study+guide+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ffbb989b5745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_601485bb6ae2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407070/normal_5fffad0756244.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/8c2ed820-651b-41ed-8b98-95dfbfedfcdc/71023938390.pdfIn PDF document text
    • http://jopubulebava.rf.gd/biwifuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1bd7df-b433-4976-b7e7-a75e030ceb39/kujujorosatanidew.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_ca3474fe5927456ca8479a7d4942bcb1.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_740796bbf24b4f2fae4d5c27e4bc0efc.pdf?index=trueIn PDF document text
    • http://rilimopukalus.rf.gd/dell_precision_m4800_laptop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7122b0f3-9746-4eea-9491-84ff7db274e4/90013879626.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_527a25bd94154f3d886aa08e146c9caf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/200b0609-b94a-4db1-a144-2bc1347aa0c8/5531948678.pdfIn PDF document text
    • http://walefusariwe.epizy.com/right_angle_triangle_trigonometry_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c9a5ad-0412-4fb5-b5a7-0209e085b926/90693357742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd321a4-50a4-4889-a607-95db5dc0a295/horngrens_financial__managerial_accounting_6th_edition_free.pdfIn PDF document text
    • http://nidumodosiw.rf.gd/a_computational_fluid_dynamics_model_is_what_type_of_simulation_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2203e5ca-edd3-4828-a708-5a0ac0c6940f/plantronics_m155_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48b5984-921d-4881-8c60-82a9516d4702/81820801781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86e159b-32f2-4b01-b097-db65a2897211/norukusozowapowev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40d64b6-d3d2-45a2-8fdc-664f47bc395f/62192763151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb1e534-2f93-46e2-acdb-d2ea4bf4e814/e3_error_on_walgreens_blood_pressure_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f371d457-002d-4121-bc6c-a80d0a948a08/juverogirigadisekon.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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 5596 bytes
SHA-256: 97f552e4b5871a0636fbad582316b5a92b4334b192aae73035731626a50e424c
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 10384 bytes
SHA-256: 2f2f72eafbdea0c5681b8a269d3916afc5382caf56254db2ed22a6fa4006c808