Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61688bdf588130d…

MALICIOUS

PDF

76.3 KB Created: 2021-04-13 15:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3865785835c61dac271c21c149a0f861 SHA-1: faa621046e76fec9c5a7a45541f980b57498bad0 SHA-256: d61688bdf588130df4c6197294ab0ee77894ce510a71f4b8ee2e6d25296d9197
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. 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 URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=spring+framework+vs+spring+boot+version PDF link annotation
    • http://netolenogafa.getenjoyment.net/analytical_report_sample.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/reasonable_adjustment_letter_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368218/normal_5fe1350542148.pdfIn PDF document text
    • https://cdn.sqhk.co/legexere/kghjgoE/44839388084.pdfIn PDF document text
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/darinugifof-redoza-korijebonabineb.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/igdwgjc/sustainable_development_goals_2030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_604f05da45681.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/shark_duoclean_powered_lift-away_speed_vacuum_filter.pdfIn PDF document text
    • https://guxizipib.weebly.com/uploads/1/3/4/3/134367178/seniduf.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/riwirikafomunomuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fd5f3ade8dd5.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/haSNWgg/xojepujanilanukarevufak.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/temowegimofowowij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_602c7b2d054e4.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/vepovunokato_fofodifogene_norejid_ruravijop.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/etoiajj/fopetugeraripelamefeweli.pdfIn PDF document text
    • https://cdn.sqhk.co/pofadugilip/ifjejh0/55959799870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_5fd76fdc03479.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wezikadedikenev.epizy.com/nisurexupewulifonuzom.pdfIn PDF document text
    • http://vifajefowim.epizy.com/pokemon_fire_red_release_date.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_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 5648 bytes
SHA-256: 7e0c444aa867e7c8cd8525b0a8ae58631268306a7d9e9a56f60ec0addd6b9019
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 10708 bytes
SHA-256: cef93914a98ef3f1cf5bd03c67f9161225566533fefcbc81720dbc58b2ace685

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