Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce89943ff43b7097…

MALICIOUS

PDF

38.5 KB Created: 2020-04-07 20:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17677c25c3de5e20b766c06a6e32018a SHA-1: 055024da04d5f096f323ce9c21d516efb7d3e563 SHA-256: ce89943ff43b709779959baa311e3ee51228ef563d98e9b371f81b23b94dad97
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a distribution point for malicious content. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains references to the external URLs, reinforcing the attack pattern. No scripts were extracted from this sample.

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://unique-security-solutions.com/uploads/1/3/1/4/131437233/131437233.html#de+descoberta+faz+de+amor+korea
    • http://soybeanessentials.com/uploads/1/3/0/8/130813852/7747569.pdf
    • http://theatmpro.com/uploads/1/3/0/7/130776750/munevexogufu.pdf
    • http://dreammakerkerb.com/uploads/1/3/1/4/131453134/729714.pdf
    • http://katie-broderick.com/uploads/1/3/0/5/130543402/a9738c754991.pdf
    • http://clearallservices.com/uploads/1/3/0/6/130620800/9437549.pdf
    • http://thebiscaynegardens.com/uploads/1/3/0/3/130324207/nosivaveruri_dotaba_mabenoxemisone.pdf
    • http://familyofficecoinvesting.com/uploads/1/3/0/8/130874101/3829413.pdf
    • http://cloutierandassociates.com/uploads/1/3/0/6/130639609/8151747.pdf
    • http://saigonofficecenter.com/uploads/1/3/0/7/130739726/65ff3cd5d64b.pdf
    • http://wintertexanlodging.com/uploads/1/3/0/6/130622047/3548787.pdf
    • http://mythicbrew.com/uploads/1/3/1/1/131163492/satimokiroza.pdf
    • http://scattrbraind.com/uploads/1/3/0/5/130588656/zajekilixoro.pdf
    • http://ristoranteprincipi.com/uploads/1/3/0/6/130620428/7eb6076326.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_off00006aad.bin
fe2bd73fea1dd3a87bd0a84357ca5e4937993a8639d7eb7365a947afb59207e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAD 9924 bytes

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