Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabcda524530c460…

MALICIOUS

PDF

79.9 KB Created: 2021-04-09 00:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96030be626ed01604068d28b4f4e524c SHA-1: da3906b257ae68273add92b9b830c79e8a140c3a SHA-256: fabcda524530c4606af04d23acbaab831fb6e43cb67fc1055f067f43b2919d74
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://nipisod.ru/strik?utm_term=formula+volumen+de+los+prismas PDF link annotation
    • https://cdn.sqhk.co/tozegatopaxu/jbhgGjf/46973847967.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/2iiCpsD/wewawumijukadegagenira.pdfIn PDF document text
    • http://wowovamofuzo.sportsontheweb.net/antimicrobial_properties_of_allicin_from_garlic.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/d97fabf9-0bbf-4b05-9dc0-c39185f47fa1/52700392379.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/international_socio-cultural_environment_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45d82e2-c0d9-4c75-9379-91817087b7e0/31766154200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0314dc-fdcd-40a2-b8c6-837f53cf09aa/tirovijabuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/wugudutef.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_e03aef432dd646588c6f9deb6c6048b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/ifrs_conceptual_framework_for_financial_reporting_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/athlean_x_max_size_workout.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_a5e585aeed71438db04cf7b81f8f486f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/6535598078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b6b447-5511-4586-807e-cd1189c5e3e6/tagelabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72f8f70-ee58-46e9-8c7a-b130d79f9b77/66982634808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31612a40-2f55-4807-9027-2c570855bff5/how_to_pay_for_a_rental_car_for_someone_else.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdc4dd4-0bc6-4498-a6d5-373c6f2f3ebe/lakokajetafusax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a468ea6-9cd2-4912-b394-81bd4c052a64/35260773940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f049808c-a417-4c96-8879-4736e41b3141/how_big_is_my_kenmore_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0f3b0a-b3e5-4a9c-a08f-c9f256ef63f8/nozevukigitam.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/64764504531.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/cosco_high_chair_assembly_instructions.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_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 3064 bytes
SHA-256: 750b8ae9e0ccb56efd42408d9f0b2fad6e8aa4275edb6569918a4ed6f5e8248b
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 5120 bytes
SHA-256: 20fcdc89b933d0158196674f3893f380dc00e69aeb6cc4f4e9ffc00c5ae7e82f
font_02_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 12912 bytes
SHA-256: 06dceaff1309586d1d16f5fbe7d150102332047de83e1ff4e00091d5119e32f7