Malicious PDF — malware analysis report

Static analysis result for SHA-256 92128a4e6b416e4d…

MALICIOUS

PDF

82.7 KB Created: 2021-03-14 16:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c576ddf6b9743301c1d0049ffd705839 SHA-1: 5a6ef321063ff2ef264e5df4acc2b15514342538 SHA-256: 92128a4e6b416e4d1afe2de78689f237c5de01b050ad08ed43b55497dd8950ce
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The primary URL, 'https://jumiwimov.ru/award?keyword=synthesis+of+silver+nanoparticles+using+plant+extract+pdf', suggests a lure related to scientific research to entice clicks. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=synthesis+of+silver+nanoparticles+using+plant+extract+pdf
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fde6659ab7a7.pdf
    • https://cdn-cms.f-static.net/uploads/4446931/normal_603fcae30f0a2.pdf
    • https://cdn-cms.f-static.net/uploads/4377717/normal_60338e5bcb61d.pdf
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fe99c37b2f2a.pdf
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fc7ef01e3a0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gofosuxubajo.epizy.com/80319187598.pdf
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_b9e3461ee1324002bc1ce7d51420c8c1.pdf?index=true
    • https://s3.amazonaws.com/rurosaveruk/kogotowibepigaj.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_b10853fdbdf7478f9e39c3815923d44e.pdf?index=true
    • https://s3.amazonaws.com/tigovatolis/dugosujuwapatasav.pdf
    • https://s3.amazonaws.com/panalipolifod/20613940585.pdf
    • https://s3.amazonaws.com/wamatasamegu/xejujejizazewategalo.pdf
    • https://s3.amazonaws.com/zarusegibitumet/80247740331.pdf
    • http://karifopiti.epizy.com/1357313946.pdf
    • https://s3.amazonaws.com/dowavelaxam/carry_on_jatta_2_online_movie.pdf
    • https://s3.amazonaws.com/rakabexozu/frasers_hospitality_trust_annual_report.pdf
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_2e3688ba6d754767b9178605b77a3ecd.pdf?index=true
    • https://s3.amazonaws.com/jifesu/tebisotulabiwemijaku.pdf
    • http://dufosulux.epizy.com/saname.pdf
    • https://s3.amazonaws.com/toniseligiwuzux/gupakezubexodalizi.pdf
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_efcb6cfc68774cd285ac602341e24616.pdf?index=true
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_518a160e836547c7816b7a90bfc32e57.pdf?index=true
    • https://s3.amazonaws.com/tomaxade/football_manager_2019_team_guide.pdf
    • http://jipawivenuzinu.rf.gd/first_five_year_plan_of_bhutan.pdf
    • https://s3.amazonaws.com/jojitagifuva/57017010110.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ca.bin
d25057b155799dce633b239ae5596740b185df6ae1cf0150ee1cbe3d2004e53d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 5748 bytes
font_01_sfnt_off0001176d.bin
9dee774554f447d689b64f55d11ea9b146680472f39e731f98162e04a809379b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 11864 bytes

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