Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c18fd61fc39cde…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 10:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b2536803ce595825bbaf257d1868368c SHA-1: f63df98b234e311882699a373a5fabc47b3da8e1 SHA-256: e3c18fd61fc39cde3649e1b96a8bd612e6dcc847aa7a6a7ddbb5f7e9449194b6
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=cameron+hydraulic+data+pdf PDF link annotation
    • http://esmoney.site/vomuswlwh9.pdfIn PDF document text
    • https://nabikiwajozipaf.weebly.com/uploads/1/3/5/3/135391661/sitofiv-lilaki-muzolu.pdfIn PDF document text
    • http://minomesiguziv.22web.org/rubevukibekotoruraben.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/8167842.pdfIn PDF document text
    • https://gasulemuj.weebly.com/uploads/1/3/4/3/134352818/vupumonasagav.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/9586d.pdfIn PDF document text
    • http://gizapiretade.iblogger.org/australian_customs_declaration_form.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/9775443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buximonerivib.epizy.com/18704955519.pdfIn PDF document text
    • http://wafogaz.rf.gd/figokixovedujutilunes.pdfIn PDF document text
    • http://vugokaduliro.rf.gd/arthritis_research_knee_exercises.pdfIn PDF document text
    • http://lemijafuw.epizy.com/debitoor_invoice_template.pdfIn PDF document text
    • http://rafetomobu.rf.gd/magneto_abrasive_flow_machining_ppt.pdfIn PDF document text
    • http://tuvusekore.rf.gd/javascript_android_camera.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/harvest_town_npc_guide.pdfIn PDF document text
    • http://mujibise.epizy.com/bharat_new_movie_filmywap.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 5224 bytes
SHA-256: 3a78fedaff580fc4a8a8191a9ede3d8468d2a062fff950f654a6064ff23741dc
font_01_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 12000 bytes
SHA-256: 2101e965354c233eb2badd9fd4146b0c576bf361733a1df061f7233098f29044

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