Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cdeff18a68af45…

MALICIOUS

PDF

74.7 KB Created: 2021-03-20 20:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2510f072752b420c941a7b9fdb287033 SHA-1: 5a58aa35eaf6f120ff58cae9a7cdc9e97cc091fb SHA-256: a1cdeff18a68af45203a7fb4e98dc94442bf1364d8d7b90b2a5b8f7b24ae669d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by 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 0.9956

Heuristics 4

  • 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://jottigo.ru/123?utm_term=aquifer+test+software+free PDF link annotation
    • http://fullcreditreport.info/how_to_clean_a_front_load_washer_filters2hsm.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/zudovajej.pdfIn PDF document text
    • http://buvavarosavadar.iblogger.org/similarity_of_triangles_worksheet.pdfIn PDF document text
    • http://55571.ru/when_to_start_intermediate_workoutbw6j1.pdfIn PDF document text
    • http://kuvonej.iblogger.org/negeji.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/tukukatukek.pdfIn PDF document text
    • http://emirofficialzm.com/pefefifuxiwuzugofes1cwef.pdfIn PDF document text
    • http://ruszaimclub.ru/138417555983t6o1.pdfIn PDF document text
    • http://watercart.ru/331431594857xml8.pdfIn PDF document text
    • http://pujesuwidiw.22web.org/estructura_de_un_anteproyecto_de_investigacion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixuzobimube.epizy.com/arbeitnehmerberlassungsgesetz_2020.pdfIn PDF document text
    • http://neromozib.epizy.com/32249989955.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/gulupemopevugan.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/9482016188.pdfIn PDF document text
    • http://janobufove.rf.gd/why_is_my_gas_dryer_not_heating_up_anymore.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/lalifiruwuvewevapojisewe.pdfIn PDF document text
    • http://gifixutazopoja.epizy.com/ark_survival_evolved_extinction_size.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/appcleaner_for_windows.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/how_to_run_a_2-3_zone_in_basketball.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/alveolitis_alergica_extrinseca_tratamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/29078313090.pdfIn PDF document text
    • http://jeludugaj.epizy.com/pemegekomegitidivazokali.pdfIn PDF document text
    • http://papilumovojulez.epizy.com/13786295356.pdfIn PDF document text
    • http://zoxutuperovizo.epizy.com/epic_7_memory_imprint_guide.pdfIn PDF document text
    • http://luwefotikejumu.rf.gd/apartment_design_guidelines.pdfIn PDF document text
    • http://vibulowivez.epizy.com/ranul.pdfIn PDF document text
    • http://pojaguteketifix.rf.gd/4220195045.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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 4936 bytes
SHA-256: cbbc0f1b84fa0cdd5c66280f3b2cb1309f2117288c80de4a2dd7bbc78b5b852f
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10800 bytes
SHA-256: 58b999468c844a517df94a9e09ae0d70f7e09c3d31df3b2459972dc326da86f2

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