Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1246d391445a19…

MALICIOUS

PDF

37.5 KB Created: 2020-06-05 09:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6763ffeeaa49b578e6a162de3031b03 SHA-1: 4fe3b95f6a4b5ff32ef0bdc881887152fba9b026 SHA-256: bf1246d391445a19da133e1217c0301c90dfbae58d4b464e7efb01539bc78d96
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files on similarly structured domains. This pattern is indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://altoedc.com/uploads/1/3/0/6/130620620/130620620.html#lightning+protection+using+lfa%2528+ligh
    • http://10102020.cool/uploads/1/3/0/9/130969352/gafonebigi.pdf
    • http://elfstrombassworks.com/uploads/1/3/0/9/130969371/6199b0d.pdf
    • http://crystal-vision-consultants.org/uploads/1/3/1/4/131483445/bb47a4.pdf
    • http://forestmossgardening.com/uploads/1/3/0/7/130775560/2a505e2e4d0b2.pdf
    • http://apacint.com.au/uploads/1/3/0/6/130604649/5865775.pdf
    • http://peaceofmindmke.org/uploads/1/3/0/2/130271015/rakowuxut.pdf
    • http://alevinewilliamslogistics.com/uploads/1/3/0/5/130539583/1079951.pdf
    • http://desigrocerywholesale.org/uploads/1/3/0/5/130539270/vipulori-jufibebisujuza.pdf
    • http://mtzinsurance.com/uploads/1/3/0/4/130436239/lomuwa_kivujefova_dovoniwokakom_difalunemem.pdf
    • http://altoedc.com/uploads/1/3/0/6/130620620/terms.html
    • http://altoedc.com/uploads/1/3/0/6/130620620/dmca.html
    • http://altoedc.com/uploads/1/3/0/6/130620620/policy.html
    • https://raroxek.files.wordpress.com/2020/06/8903818682.pdf
    • https://vutukutinom106189484.files.wordpress.com/2020/06/93828524742.pdf
    • https://livobaxuw793041599.files.wordpress.com/2020/06/wereragesazunazebonimuxan.pdf
    • https://tarunigufoza.files.wordpress.com/2020/06/gunosawipinipa.pdf
    • https://wuwijureke.files.wordpress.com/2020/06/jojurutelozojotifuwin.pdf
    • https://vagaxitevu.files.wordpress.com/2020/06/tepaxunomoxibolurazukela.pdf
    • https://bokekesu.files.wordpress.com/2020/06/febebirop.pdf
    • https://xagimiko796216007.files.wordpress.com/2020/06/10485780896.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f2.bin
7e45c32ee6ae5a99da364ec37636b197facc198c360c3f52dc93bdd8e20f6f26
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 11484 bytes