Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d7db3082e7bfe3…

MALICIOUS

PDF

75.6 KB Created: 2021-03-13 17:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 158e62aadbcad8eed699959835f15d3b SHA-1: d900a637ad905a7392928bb58b03aef798b06f7f SHA-256: 89d7db3082e7bfe39ebe7514c96991fae9e2cccb76873c76fbee4d594cf96c4b
74 Risk Score

Malware Insights

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

The PDF document uses a fake invoice/payment lure, specifically mentioning a missed child support payment, to trick the user into clicking a link. The ML classifier strongly indicates maliciousness. The document contains multiple embedded URLs, with the primary lure pointing to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/aws?utm_term=why+didn%2527t+i+receive+my+child+support+payment+today PDF link annotation
    • http://toguvuveleguna.22web.org/31456223552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486765/normal_603f27e9351f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415526/normal_5fcbd6dc4cf8e.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/hihauhb/ziwal.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/bgdidje/crash_team_racing_pc_port.pdfIn PDF document text
    • http://fesumebujurasa.22web.org/apartment_search_checklist_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fd62d3907062.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/idibhcn/nopodivodugobedaxamabezi.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/d74b0306-1bbe-41ec-b228-aa8519439661/ar_15_upper_receiver_vise_block_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/cms_cataract_surgery_guidelines.pdfIn PDF document text
    • http://bobupugarini.epizy.com/ethiopian_new_film_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/aap_ka_suroor_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/chartered_financial_analyst_program_cfa_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bda5b3-6ff2-4b3b-a19d-d2b09a0f4cdb/the_hidden_oracle_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/73523126244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a926557f-e00a-4c90-898e-ed27ef6967fb/mezopomutumitorise.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_e5c2bb6c7b48460e861c9772b180f053.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/600c2cd4-a5cc-4b13-9ab7-f91e1beb0434/what_is_the_definition_of_cartesian_plane.pdfIn PDF document text
    • http://tapepoxawire.epizy.com/bcbs_of_sc_provider_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/microservices_with_spring_cloud_udemy.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_d7dbd6e4e9ed48fa9f1516281bf2582c.pdf?index=trueIn 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_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 5524 bytes
SHA-256: d7d3f06930ca754f03738711e97b6c3c845120ca4a4b8b5e8ef42bf8f0127fb5
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 10860 bytes
SHA-256: ab9b349869362da48e7e04c157a8d35480aa9106ab0fccd5e1b34cf40641dc8b

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