Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9d5b034b8b72c4…

MALICIOUS

PDF

79.9 KB Created: 2021-03-05 10:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0d35714787289b33336d9704b458b3d0 SHA-1: 95601790777469edf36c6dc2318434f976a99076 SHA-256: ff9d5b034b8b72c406697f12b822b3806532e2fb53979f61e048c64b983405e9
66 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 flagged as link farms. The ML classifier strongly indicates maliciousness. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=thus+spoke+zarathustra+the+dance+song PDF link annotation
    • http://m-laskin.ru/unitedhealthcare_provider_number_authorizationby5b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421937/normal_60390c654360b.pdfIn PDF document text
    • http://mybiol.site/los_objetos_fractales_benoit_mandelbrotkazbm.pdfIn PDF document text
    • http://lnstagram-helping.live/subegemipenowevozogelilu5cj2p.pdfIn PDF document text
    • http://italysummer.fun/how_to_play_catan_expansion_packh094o.pdfIn PDF document text
    • http://emmetrix.net/elantra_ad_service_manualnfxqa.pdfIn PDF document text
    • http://usacarins.com/velenakeko3egcp.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/bigger_leaner_stronger_body_fat_calculator.pdfIn PDF document text
    • http://segway-wheelchair.ru/zunuduvitupivaxxh4c.pdfIn PDF document text
    • http://br1.red/58838968263hh8n2.pdfIn PDF document text
    • http://tryadasert.online/warhammer_40k_chaos_daemons_codex_8thed7sx.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/sir_gawain_and_the_green_knight_summary_part_1_and_2.pdfIn PDF document text
    • http://arendaavto.taxi/devexepamegedivi12kyn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470207/normal_6016c1f08a9af.pdfIn PDF document text
    • http://biomaniks.website/xozusanosekawuridubistqj86.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/16484079266.pdfIn PDF document text
    • http://leadtop.co/7102247072075tdg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gumagabu/jirinenobenilab.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/credit_report_online_dubai.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/how_to_calculate_for_half_life.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/37914125082.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/peace_offering_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/68780373463.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_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 5368 bytes
SHA-256: 89664f7ab67294052a835bb0328c002fb616213a736c8dc7c45774d362b15079
font_01_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 11068 bytes
SHA-256: e763ae1ed5cd9218c0213b163d2f5636ca233a5c1dc2d30a06e6006af68164c1

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