Malicious PDF — malware analysis report

Static analysis result for SHA-256 28687f9486eddb66…

MALICIOUS

PDF

39.5 KB Created: 2020-06-22 05:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e460a1ec1331529f024290a6311071ba SHA-1: c9d7cca9e23b067135aaddf76c8133febcda9194 SHA-256: 28687f9486eddb660a8356c4009b549994eac7488e5c5b498aa68b33000df4cb
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body contains multiple URLs, suggesting the primary purpose is to redirect users to these external sites.

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://acclimatize.com.au/uploads/1/3/2/7/132711973/132711973.html#public+goods+and+externalities+pdf
    • http://mybrandedhvac.com/uploads/1/3/1/0/131070441/4904936.pdf
    • http://glossyship.ga/uploads/1/3/0/2/130270936/venolokedilofazuje.pdf
    • http://dronestuff.com/uploads/1/3/1/0/131070382/nuwupi.pdf
    • http://74-123-76-16.mgwnet.com/uploads/1/3/0/7/130776149/4706420.pdf
    • http://rivercurrentgroup.com/uploads/1/3/0/6/130621829/d22f459531eb.pdf
    • http://komchoprestuarant.com/uploads/1/3/0/6/130604580/1efac0248e2e.pdf
    • http://academievoorhetleven.nl/uploads/1/3/0/7/130775379/9875615.pdf
    • http://kst-odense.com/uploads/1/3/0/6/130639442/dekevemofewixiwapag.pdf
    • http://dellstylehomes.com/uploads/1/3/0/5/130588263/6790095.pdf
    • http://afrobright.com/uploads/1/3/1/4/131409557/ad364.pdf
    • http://ruben-moss.pleasingfood.com/uploads/1/3/0/4/130476502/wabugowukifot_xekit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f58.bin
3e1b3c12fb11e9b13ef4cafc72c739b081f837eb616a4f67664ad9aafe28ff69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F58 5416 bytes
font_01_sfnt_off000071c1.bin
891bc5ab5c60874e1e41c70769e5c74cb34ea99a83d59e8020d34e7f9b7f6b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C1 9492 bytes

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