Malicious PDF — malware analysis report

Static analysis result for SHA-256 754497419c49dff6…

MALICIOUS

PDF

88.6 KB Created: 2021-04-07 15:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09040557c16cd08a3ceb3b79994ed110 SHA-1: 1370e50bfc868a609ada263d8a31a673294bd194 SHA-256: 754497419c49dff6953ed59847060e4d02cdda2368e5966ee51b3a9d0e696f29
96 Risk Score

Malware Insights

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

The PDF document, disguised as sheet music, contains a significant number of external links, indicating a link farm or a distribution mechanism for other malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs supports a phishing or content-luring attack pattern. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://pelibifir.ru/123?utm_term=harry+potter+opening+song+piano+sheet+music
    • http://bakelenodizaro.iblogger.org/notorious_big_juicy_video.pdf
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6020a17344d4a.pdf
    • https://cdn-cms.f-static.net/uploads/4492275/normal_6037fabf6db1e.pdf
    • https://cdn-cms.f-static.net/uploads/4404308/normal_60304eeaaae8d.pdf
    • http://wonamibux.22web.org/agile_methodology_tutorialspoint.pdf
    • http://republvinb.fun/is_giving_riba_haramls4jf.pdf
    • https://cdn-cms.f-static.net/uploads/4379964/normal_60325ffe400a1.pdf
    • http://lawexape.mygamesonline.org/basidiomycetes_life_cycle.pdf
    • http://sokixatov.mywebcommunity.org/sokovidoluwu.pdf
    • http://livethailand.fun/kavekulekadutofikokuzws1bb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_85028f5ee455474597518159703c927a.pdf?index=true
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_a976e5314938417eb3413e0a457170bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14f8f969-d7b0-48f2-901e-ae06247d0633/you_are_good_hallelujah_tye_tribbett_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/fdf49813-c2d6-4bd3-8bac-1b6f4e209a9a/86963092885.pdf
    • http://fedubumisuvek.epizy.com/folanosanovutatudiw.pdf
    • https://uploads.strikinglycdn.com/files/d6cc42dd-187d-4c79-be14-b0c19277404d/life_comes_from_life_theory.pdf
    • https://uploads.strikinglycdn.com/files/65634ba6-20c7-4d75-bd16-564f239650a2/how_big_are_daphnia.pdf
    • http://saluwagasa.onlinewebshop.net/mugapavajimo.pdf
    • http://getijus.epizy.com/65059140641.pdf
    • https://uploads.strikinglycdn.com/files/4456e0f1-bc75-4ca2-8098-1d3cc4e03cfc/starting_weight_training_at_50.pdf
    • http://rowagaparik.rf.gd/runurapudelajorozexijepuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ae.bin
35e8338a5e0fb2770c568b657f9719ec1e3526908941e1143db74e2f20c6a1e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 5376 bytes
font_01_sfnt_off000116dd.bin
6be6c04d3ffdd39c3ca972fc4782e72a75117ffe95904df99ee63ff8c8d66308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 11532 bytes
font_02_sfnt_off00013df2.bin
84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF2 16100 bytes

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