Malicious PDF — malware analysis report

Static analysis result for SHA-256 da48a3be6f633ae8…

MALICIOUS

PDF

67.4 KB Created: 2021-04-16 21:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0472387fd22df470ec9c10a66f70f20 SHA-1: 51692cd2066f25ca41f49f722912d1f1d1747033 SHA-256: da48a3be6f633ae8122e188115a904ab4977178081c2839c096f2969b33b2f47
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=ancient+world+history+textbook+online
    • https://cdn-cms.f-static.net/uploads/4476757/normal_60501d4a02680.pdf
    • http://sikakapu.medianewsonline.com/al_quran_translation.pdf
    • https://takoremitivo.weebly.com/uploads/1/3/0/7/130738963/1929769.pdf
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/japetuniwuf.pdf
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5feaf10027190.pdf
    • https://static.s123-cdn-static.com/uploads/4449417/normal_60089b2000bba.pdf
    • https://fulopovesaj.weebly.com/uploads/1/3/0/7/130740112/lewikire.pdf
    • https://sulipebi.weebly.com/uploads/1/3/0/7/130739254/7566682.pdf
    • http://towonededuv.medianewsonline.com/what_are_some_good_basketball_dribbling_drills.pdf
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/latafip_gurolukevawubof.pdf
    • https://jekaboda.weebly.com/uploads/1/3/5/3/135398795/23628.pdf
    • https://static.s123-cdn-static.com/uploads/4490367/normal_5ffa3ab7ca98f.pdf
    • http://jepegupunu.mygamesonline.org/75908374443.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/ponivimadeweza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://toxifiv.myartsonline.com/aflatoksin_nedir.pdf
    • http://sagoralezerelo.onlinewebshop.net/xaroxusuzavuwiwukenado.pdf
    • https://s3.amazonaws.com/fixararololu/tezixir.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/ccir_stands_full_form.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_off0000ce5d.bin
0d123afc0d20c2d1280d32909a8e7423bb0b1da22d87e67a0e2fc4d06ca5ea36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 5272 bytes
font_01_sfnt_off0000e056.bin
9429478a7aa975f7362221d46eb7a08e477613d8c11e96a7c66d5f427d37f667		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 9452 bytes

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