Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc18019756c02fc…

MALICIOUS

PDF

77.4 KB Created: 2021-04-01 01:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: deff44055a4e7232b1ae67aa6188b849 SHA-1: 0477e51c1c924f69e7d222ecf1334ba846371904 SHA-256: fdc18019756c02fcf50295a550d9fa07fccbccaa4dcbdf92ecc2a82301a8661c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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/wix?keyword=lake+miltona+mn+ice+fishing+guides PDF link annotation
    • https://cdn.sqhk.co/munuluxel/fgiWOgf/graphic_design_jobs_kansas_city.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/guUdhdg/xezejukaw.pdfIn PDF document text
    • http://getyourscore.info/vubatepuvabonibegit3.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/p6jhFjQ/puzefejadurodapisumoronu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5fed01a08cc6d.pdfIn PDF document text
    • http://uabiomanix.xyz/14781084132785ct.pdfIn PDF document text
    • http://antonioit.space/44068984904mt3ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_604ba50f55bc3.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/rrb_bank_exam_syllabus_2020_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_605f83aad8f0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470825/normal_5fde8aef906c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_6028828b98d18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/640506636.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/61704419012.pdfIn PDF document text
    • http://xajalad.epizy.com/lowifukawibakike.pdfIn PDF document text
    • http://wadokeg.epizy.com/case_580m_backhoe_operators_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/13883867628.pdfIn PDF document text
    • http://gedamodeges.epizy.com/inverse_trigonometric_functions_practice_worksheet.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/mogonoxed.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/chest_dips_form_vs_tricep_dips.pdfIn PDF document text
    • http://rigelosatabureb.epizy.com/cetol_dek_finish_application_guide.pdfIn PDF document text
    • http://zixugudarasol.epizy.com/minecraft_hong_kong_international_airport_map.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_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 5224 bytes
SHA-256: 40aa8db6561c8dde7a2a15f1534709cb27682114420e44483e9be57bc660ca9b
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 10448 bytes
SHA-256: 01286ab87916912948c99cc3129d8be9659f2fbc683b0c399a7d4c3ba1ea8884
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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