Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a419ff1c952733…

MALICIOUS

PDF

75.5 KB Created: 2021-03-19 04:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 77f708656fc70a5e2a3125f3607b95d7 SHA-1: 7304e64c1ae7cb01c4c4b6c0a5f621a14df698d1 SHA-256: d7a419ff1c95273323a5433648f2e7b0c01bcf0bea86539144dfa89fc6d4949f
74 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of numerous links and the 'SE_INVOICE_LURE' heuristic point towards a social engineering tactic to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=fractions+decimals+percentages+equivalents PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383801/normal_5fcd659cef184.pdfIn PDF document text
    • http://fuvirakopu.iblogger.org/barclays_payment_receipt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_5fdb765404905.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/ie01Zij/bisokujorinikikikopuseref.pdfIn PDF document text
    • http://mebelintera.ru/duzitovetfouh8.pdfIn PDF document text
    • http://study-english-04.space/dosaxalolarosutaguxrgenz.pdfIn PDF document text
    • http://yellownatural.space/the_boy_in_the_striped_pajamas_discussion_questionsyvs3z.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/Vibhhjg/learn_to_sing_online_for_free.pdfIn PDF document text
    • http://about-igsupport.com/how_to_replace_the_charging_port_on_samsung_tablettg6q2.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/qg4viia/rubakimakulipinewida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_601380a474dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_601b35799ba2a.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/jihXgjc/bubble_hero_2_pc_game_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipofib.rf.gd/the_movie_business_book_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383969a3-3dca-445e-91f1-0b6dc5289ce4/derapokokugepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039adacc-9a36-41d8-b1a5-247009031be5/ate_quando_entregar_o_imposto_de_renda_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1853d799-0b4c-45ae-9b6a-fc2250871747/federal_criminal_lawyers_in_houston_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a401e5-35d3-4047-9a84-3333a1a67600/15081577993.pdfIn PDF document text
    • http://wimixuv.epizy.com/biochemistry_stryer_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcde4a15-910d-4417-b7cc-d9dc6fe4c4fa/garmin_vivosmart_4_manual_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97dda65-6a5f-45f7-967b-09d45b8be738/lumoxuseju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2550db7-c8a2-480e-a99e-d2edc0caaf51/8839215557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f94c32-44c2-4ae2-aadc-93fe3ff0dc57/machine_learning_and_ai_are_different_names_for_the_same_thing.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_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 5532 bytes
SHA-256: 363eb02a7736d0cebe9448944418799ff31b3b82736edcce30146ee41eed7086
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 11088 bytes
SHA-256: 57eb87f1da8b558527bb4c75f17a1f58b5b1694fcff1569d3dceb564c4986f74