Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc57b55b3dad4bf5…

MALICIOUS

PDF

41.0 KB Created: 2020-03-21 12:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e3b3aab608fff5f6adb272e52718a72b SHA-1: e030d93d3126ffbb3bf362e514cf71bca3162756 SHA-256: fc57b55b3dad4bf558b23f334a4d1f2a72b0b9eb249552809a04380477c7b786
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, includes the URL http://yasminevintage.com/uploads/1/3/1/0/131070689/131070689.html#10+ejemplos+de+abstract+nouns, which is also present in the list of extracted URLs. This suggests the primary purpose is to redirect users to a network of potentially malicious websites.

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://yasminevintage.com/uploads/1/3/1/0/131070689/131070689.html#10+ejemplos+de+abstract+nouns
    • http://americashomegroup.org/uploads/1/3/1/1/131164555/janofadax.pdf
    • http://realcivilwarlady.com/uploads/1/3/0/4/130493968/kovow_sonam.pdf
    • http://www.junctureone.org/uploads/1/3/0/7/130738859/sitepelima.pdf
    • http://espacemathias.com/uploads/1/3/0/6/130604561/demagudene.pdf
    • http://daniellerolfe.com/uploads/1/3/0/6/130621852/42a23eb.pdf
    • http://aprilgardens.org/uploads/1/3/0/4/130491752/b45618196.pdf
    • http://www.jubercreations.com/uploads/1/3/0/6/130639867/409942.pdf
    • http://acifte.org/uploads/1/3/0/6/130604151/8bfd211ba0b7.pdf
    • http://henkireika.net/uploads/1/3/0/8/130873917/buzaxavonasovuxoz.pdf
    • http://www.stunningsphynxkitten.com/uploads/1/3/0/6/130605349/acd8718b.pdf
    • http://woodbridgefamilyphotographer.com/uploads/1/3/0/5/130543156/gidexupe-febununobifig-duregojike.pdf
    • http://www.thefrenchpress.net/uploads/1/3/0/9/130969748/bupalojugi_zarekoxumome.pdf
    • http://alexisarenas.com/uploads/1/3/0/2/130291724/8832994.pdf
    • http://digitaltuxstudio.com/uploads/1/3/0/2/130291785/8482055.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_off00007502.bin
ce2455e1d2ff6bfe0ebdad739eed3d744d6a2779eb503778cb1791051f8aac6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7502 8612 bytes

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