Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ffe831bcf61b63…

MALICIOUS

PDF

87.5 KB Created: 2021-05-16 05:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 61bee588d5cc6e689c56f6a5cf13decf SHA-1: 28876402b3b956be9ede1fa4e2f51d48c47dfbfa SHA-256: 29ffe831bcf61b6330c1853823bdb9a1552398e2e516da12fdf9a37ff42d20db
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially malicious sites or for SEO spamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://druttle.ru/strik?utm_term=gre+english+vocabulary+book+pdf PDF link annotation
    • http://fuxisileza.mywebcommunity.org/la_sibila_libro_de_los_sueos_gratis.pdfIn PDF document text
    • http://poxedon.22web.org/24213024308.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/vakusaturabetuwi.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/besawemalox.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/1EUijcK/xipojusajawuvup.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/kobogoneri.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/xazotinelelala.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/21077068683.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/iMhjdgi/alienware_558_mouse_review.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/rakapite.pdfIn PDF document text
    • http://helplnstagram-confirm.com/rupupaminojireeo1oo.pdfIn PDF document text
    • http://soldonlittleton.com/charlas_de_seguridad_de_5_minutos_pd9gje9.pdfIn PDF document text
    • http://connexion-amelii.xyz/betadine_scrub_and_paint_guidelinesptby7.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/wunusojiserenopefufu.pdfIn PDF document text
    • http://mon-cmbretagne.best/xitenifutaxevivataiku6x.pdfIn PDF document text
    • http://baby-slings.ru/mini_displayport_female_to_dvi_male_adapterxg5el.pdfIn PDF document text
    • https://jumolixebeze.weebly.com/uploads/1/3/4/3/134352805/bd9e32030b94913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_bcdf7acdd4824cb8a34d4385ceecbac0.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_e17b17a5a8134aa38822ff4ee293f7b9.pdf?index=trueIn PDF document text
    • http://bitines.myartsonline.com/74661522995.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_57eb7930e6b949d89049540178231984.pdf?index=trueIn PDF document text
    • http://favuzokusom.rf.gd/yahoo_email_can_t_attachments.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 5616 bytes
SHA-256: 9aee0805d75e48d72b61034ffcc875c0fdf533acd1256ebb6ea1141674c3d6f1
font_01_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 11436 bytes
SHA-256: b3129de03a5110211c58dfac3ee830d096d3b16a28d3ef20cea383ef02e8d33d
font_02_sfnt_off000140b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e