Malicious PDF — malware analysis report

Static analysis result for SHA-256 113f9aadc629d743…

MALICIOUS

PDF

44.9 KB Created: 2020-03-28 04:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9cfc63bafcf7af47ff71650884a30e1a SHA-1: bb985fc467e04f2a9ddffc3d63cad38cba75a933 SHA-256: 113f9aadc629d743033461ddd552ce82e44510a50d8fd65dd577c7eaaec4a40c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The embedded document body text, though garbled, contains a URL that is also present in the list of extracted URLs. This suggests the primary function of the PDF is to act as a gateway to a link farm, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of numerous external links indicates a malicious intent to redirect the user. The ML classifier strongly supports the malicious verdict.

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://julianthology.com/uploads/1/3/0/8/130814851/130814851.html#juegos+tradicionales+en+el+patio+de+la+escuela
    • http://webmail.solocreed.com/uploads/1/3/0/6/130605182/fazasiveje.pdf
    • http://thedistrictqualityllc.com/uploads/1/3/0/2/130288321/699a7da4689fc5.pdf
    • http://tempojeunes.com/uploads/1/3/0/5/130589064/7d860b0c6eef15a.pdf
    • http://wifihotspot.shop/uploads/1/3/0/6/130639083/9610324.pdf
    • http://saudiexpats.org/uploads/1/3/0/6/130621345/d549d4.pdf
    • http://pandb.berlin/uploads/1/3/0/4/130435876/e602aad0dd7.pdf
    • http://michaeltweekesassoc.com/uploads/1/3/0/3/130313613/9333752.pdf
    • http://jeffbrockway.com/uploads/1/3/0/6/130621214/16733083639b.pdf
    • http://sialiacademy.org/uploads/1/3/0/4/130490451/41b9b0d8.pdf
    • http://whambaa.org/uploads/1/3/0/3/130379718/3929600.pdf
    • http://finishmyfoto.com/uploads/1/3/0/8/130874087/foropuvemebigi.pdf
    • http://beautygardensalonwi.com/uploads/1/3/0/9/130969627/4889ea4f97bc19.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd5.bin
1b0baab4979c1b11be4366b087c0f149f16915beceff30a0bf294645432f3315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 9128 bytes
font_01_sfnt_off00008ee3.bin
08b01e490e2d1b602bf4e3799eede6a1cc17bdc62ffd6a344964b9f54203d399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE3 16164 bytes

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