Malicious PDF — malware analysis report

Static analysis result for SHA-256 052d22ec6507b3a4…

MALICIOUS

PDF

91.1 KB Created: 2021-05-09 17:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c2307975704174d1d39de05addeaef6 SHA-1: 745a52c7ef49dbe09cbe2a2f95a809f43e35ecca SHA-256: 052d22ec6507b3a48a62747494606aa1c6df0d488069e9fb97ae4b807980affc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=10+easy+guitar+riffs+for+beginners
    • https://badazunezibak.weebly.com/uploads/1/3/5/3/135338398/sejimagofe.pdf
    • https://cdn-cms.f-static.net/uploads/4393776/normal_6031e7e3c2da3.pdf
    • http://fedezin.scienceontheweb.net/2687164510.pdf
    • http://tuwukadinem.mygamesonline.org/female_christian_names_and_meaning.pdf
    • http://linavaluviriv.getenjoyment.net/bodoland_lottery_result_today_download.pdf
    • http://wrestling-mma.com/86991942618ci12w.pdf
    • http://livecopyrightverification.com/87848699065smrad.pdf
    • https://pebuxunuvir.weebly.com/uploads/1/3/1/4/131483235/vufanimejax-sizoxage-sunidogutagu.pdf
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/15434189e8347.pdf
    • http://busijizi.medianewsonline.com/vepomosowinomajo.pdf
    • https://static.s123-cdn-static.com/uploads/4444623/normal_5ff9d099c18ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_687341f8c34a40c2870c642dfc92e670.pdf?index=true
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_021bb83251854f98bc199b0a378f1b86.pdf?index=true
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_5c6d1634393e465984afaf218e8980e5.pdf?index=true
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_738ab0cceba649c485e69dc6e9ea7d67.pdf?index=true
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_9ce926b72aea426a86476c80b6a3cb1d.pdf?index=true
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_0a09f76dec454c908e3391eb7438f169.pdf?index=true
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_92bd6fb2b07b46b789dc747dbb845c38.pdf?index=true
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_79e8b12f31e0435683e9a0d9322117dd.pdf?index=true
    • http://zagofij.onlinewebshop.net/how_much_do_occupational_therapists_earn_a_year.pdf
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_aae65511a4dd4d6fb22a98d0b884ed59.pdf?index=true
    • 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_off0001279d.bin
90c2daa3f2b045d0c06b13b66d16a2beaf976a43324a1054d290322a387bb1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 5244 bytes
font_01_sfnt_off0001398f.bin
55773a09e8419f9d1cc534f40cb4db9413d5657141681f123b48bf81903541a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 10588 bytes

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