Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cea9836a6d8dd36…

MALICIOUS

PDF

34.9 KB Created: 2020-04-18 05:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19ff987d877692a9c9322f1d53959e61 SHA-1: 2af0814789824a8a282b7ef074bb800dfd098dd2 SHA-256: 4cea9836a6d8dd36e8100c6a48dc3ed734c2fc0cffc406775b449bcc20c59477
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The presence of a link farm suggests the primary purpose is to drive traffic to other sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://allamericandogexpo.com/uploads/1/3/0/2/130272363/130272363.html#terraform+azure+sql+database+user
    • http://loridavey.com/uploads/1/3/1/3/131379041/wozepunopod_rasifovibajuxe_wuwug_lifawe.pdf
    • http://laserlab.be/uploads/1/3/0/7/130775451/jinibobodufe-puxomufa-fuluxut-ragakotunalax.pdf
    • http://springgreenteahouse.com/uploads/1/3/1/4/131412426/8223461.pdf
    • http://creativecapturesbydey.com/uploads/1/3/1/4/131437775/2185346.pdf
    • http://jacksonmaintenanceandrepair.com/uploads/1/3/0/5/130590008/7558741.pdf
    • http://camerasandchocolatesphotography.com/uploads/1/3/1/3/131381480/lijumoxutid.pdf
    • http://bambusaglobal.com/uploads/1/3/1/6/131637131/c6f5dbf3.pdf
    • http://zenpresentations.com/uploads/1/3/0/5/130588964/1269567.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_off000060ed.bin
deb2d6326ffa8dd7d20f288556653c5834f8636c85cfe72979e7b510bfa3f7a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 8052 bytes

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