Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a9ce880f1e9a04…

MALICIOUS

PDF

74.2 KB Created: 2021-05-29 10:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 078af1c75500188f3278ccb630864133 SHA-1: 79c3454b97b1417226713b9b451e6331ebbb6bde SHA-256: 23a9ce880f1e9a04d3ed3439fc80e8161f55c2a3fa6a0743679fcf1462bc71ff
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a link farm and a brand-impersonation credential phishing lure, specifically impersonating Amazon. It directs users to a malicious redirector URL. While no scripts were extracted, the ML classifier strongly flagged the PDF as malicious, and the presence of external links suggests an attempt to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bakasilamor.weebly.com/uploads/1/3/1/4/131407315/4246827.pdf.
  • 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/wb?keyword=lg%20g%20pad%207.0%20protective%20case PDF link annotation
    • https://bakasilamor.weebly.com/uploads/1/3/1/4/131407315/4246827.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/segiferafomagul_wagunexotozip.pdfIn PDF document text
    • https://kugavibutatabo.weebly.com/uploads/1/3/4/6/134613496/d478b8dd6ae.pdfIn PDF document text
    • https://soxobepasi.weebly.com/uploads/1/3/4/6/134677568/riwimiwekimalara.pdfIn PDF document text
    • https://mefiwipof.weebly.com/uploads/1/3/4/3/134320940/4eab0937f82.pdfIn PDF document text
    • https://jadilibetaz.weebly.com/uploads/1/3/4/8/134871175/4078829.pdfIn PDF document text
    • https://damelexivukek.weebly.com/uploads/1/3/4/7/134771288/korebojukokupaf.pdfIn PDF document text
    • https://tovefejuxula.weebly.com/uploads/1/3/5/3/135325554/vubuxuj.pdfIn PDF document text
    • https://futixaxez.weebly.com/uploads/1/3/4/5/134516919/49a5ef5baf898.pdfIn PDF document text
    • https://fepuvagugi.weebly.com/uploads/1/3/4/7/134767339/vumok-wozaz-loxuka-kegidisi.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/93f67a44-1962-44b0-b511-81cfa8214508/67795982115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b13210-7e68-45d8-996e-a7876c149f15/kowuramuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2f7176-0fab-4d0c-a8ef-cd83eec8dc12/shatter_me_lyrics_lindsey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6f3d30-b1b2-4d23-b0fe-37ff1c88b299/tell_it_slant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ae8b82-2cb5-411a-aeb7-ce657126d149/free_printable_military_alphabet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfb0514-86f5-4d52-8b5f-fa157b48896f/french_irregular_verb_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b22229-dc0e-4853-9cbd-afec7fd3e1ce/what_is_the_main_objective_of_ra_9178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc04e8f-43d4-4ff8-b7ee-d40a031f5f36/modern_chemistry_workbook_answers_chapter_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09891af-5707-4c6b-9d76-3e1ef31c62d6/vosuzomirixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77e7f02-c123-4c52-a505-a71e55403249/81475898797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7495ac24-77e7-4b0b-b1b7-da353f95a5e6/line_6_firehawk_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702e5671-7c05-4235-a8ba-25583f05ace9/banel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4a5c4b-db74-4a1b-b66b-005b831be10c/charger_for_ipod_nano_4th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c98a11-ba84-4b2d-beb5-252840319f04/widuvene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c33d3e-8c10-4ae0-9ed9-2906566c0ae9/the_legend_of_zelda_the_minish_cap_romsmania.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d495ed-c873-4fdd-9316-32e22c1c90e6/32824110682.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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 5464 bytes
SHA-256: 650d3a0781257ace9c0c5986157f2a1ec7db4676ef0ac787cea68dbca459f6e4
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10264 bytes
SHA-256: 45400feb5bfeb86f3bb56226f795f8bf788c991eba06c8eeed3fefa3cdb1bd3f

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