Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6f6eeafd9fe6f1…

MALICIOUS

PDF

110.2 KB Created: 2021-05-19 14:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ba8b402cd1be0e815ad509b8d72a3d02 SHA-1: 7536881895fca16fbce1ae05ccc990f39605089c SHA-256: ee6f6eeafd9fe6f168753afb5f93e0156aeb422f7e0cb990e9488508b391d85e
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 0.9991

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://botokaw.ru/strik?utm_term=how+to+study+for+exit+hesi+rn PDF link annotation
    • https://dajixogemozuv.weebly.com/uploads/1/3/1/4/131438707/403b2cf.pdfIn PDF document text
    • https://beredixe.weebly.com/uploads/1/3/4/7/134762790/fotoburi.pdfIn PDF document text
    • https://rixemeja.weebly.com/uploads/1/3/4/7/134711448/2037520.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/4445471.pdfIn PDF document text
    • https://rajikaluniker.weebly.com/uploads/1/3/1/3/131383998/4f159f43.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/xanaz-tetojijofuguwot.pdfIn PDF document text
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/5839410.pdfIn PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/cebbd8faa.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/4b3828d0-f3f6-4bff-985e-7a4577c751dd/wiruvawujusefakaganotevum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bb67d7-cc4b-4fda-b463-f71c9f61a342/ruvazutovesow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c692edf4-b8ec-40a6-be08-c87c3e590c76/38067054701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ee4910-d576-4583-884d-66db02a44519/potowafulofidufi.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/wogosofimabuxajozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea2a0aa-67ec-443b-9d38-f89e4404f8c7/befunujukukujabig.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/ketosavuzifegijosaxib.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/converting_fractions_to_decimals_worksheet_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/namuwozedozifix.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/pukimafapadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ba3c28-6bcc-451d-8794-9fa31654919e/26724070469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1aa5015-4d03-4f8f-a13c-1b77620b7e08/what_is_the_importance_of_food_pyramid_in_sustaining_good_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d87b948-1140-4135-b1e6-e712c7f6355b/divok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781f8458-76b7-49c4-998e-2c70c47671b1/21567953128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25338f2-bb7f-4029-8f0f-8f60862d9a3e/kumolozajifukojutadotu.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_off0001735c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1735C 4976 bytes
SHA-256: a9649b44569d52b51f8f58423335a8028c42d4c37980d6daabc15978e8a28d44
font_01_sfnt_off00018461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18461 11264 bytes
SHA-256: 114d5224a1e10051718b3d49f1f38749df8840952b094ca89b49770fa928c924