Malicious PDF — malware analysis report

Static analysis result for SHA-256 039aea33059d2db8…

MALICIOUS

PDF

69.0 KB Created: 2021-03-17 01:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d777a57d935383c5e5143debd45969a SHA-1: 7c8bde13995d9df75919a97d4f812e95a26a3894 SHA-256: 039aea33059d2db8c6e2cb36d8d6cdfaea2b25b80d0b2c8f1ab9a5d2a1a480cc
104 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, indicating a link farm or a mechanism to distribute further malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically highlights this behavior, suggesting an attempt to obscure malicious activity through a large volume of URLs. While no scripts were directly extracted, the presence of numerous external links points towards a downloader or redirector pattern, likely intended to deliver a second-stage payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=laboratory+apparatus+worksheet+for+grade+6
    • https://cdn-cms.f-static.net/uploads/4452612/normal_601f9a9ab3c22.pdf
    • https://cdn.sqhk.co/lesepivir/5Eibnf4/22093890013.pdf
    • https://cdn.sqhk.co/konafomaz/4jd9pgc/11642933009.pdf
    • https://cdn-cms.f-static.net/uploads/4417422/normal_601c6a1284dfb.pdf
    • http://dasiwujupuna.sportsontheweb.net/23654802554.pdf
    • https://cdn-cms.f-static.net/uploads/4445731/normal_601f20b587010.pdf
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/vanujagogof.pdf
    • http://sipataj.sportsontheweb.net/13344150850.pdf
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/fasipuwoxuwiva-gizebepupewa.pdf
    • https://static.s123-cdn-static.com/uploads/4483083/normal_6000d51e2bbee.pdf
    • http://vutisonoj.sportsontheweb.net/the_enigma_of_amigara_fault_download.pdf
    • https://cdn.sqhk.co/pazakazagoz/NXhbUMp/jibiberuvatilufiso.pdf
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/7737560.pdf
    • https://cdn.sqhk.co/jigavozef/kjjZbOx/wbtv_charlotte_live.pdf
    • https://cdn-cms.f-static.net/uploads/4471464/normal_604aa2d052e61.pdf
    • https://cdn-cms.f-static.net/uploads/4413713/normal_604668f078367.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/palevijuj/consumer_reports_most_reliable_cars_2012.pdf
    • https://s3.amazonaws.com/jinabom/jogofopegotivoke.pdf
    • https://s3.amazonaws.com/pokorevalaxex/63228515788.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/brain_tumor_operation_video.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_off0000ceec.bin
73cbbf94f9c26997abb0cacfbf3b117b43c4f1768bc82c187c3425506390d96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 5764 bytes
font_01_sfnt_off0000e2a3.bin
11cfc690e6a94d63ab92408235a421f8363cd71e2c7a7cae7a5bffdff3be2e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 10604 bytes

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