Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f91571fd8b42a78…

MALICIOUS

PDF

29.0 KB Created: 2020-04-10 02:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4f70e23107e6984c64e07fba53a7982 SHA-1: ebca5d1076d6312177e770cb26f22a542ad5e737 SHA-256: 4f91571fd8b42a787f2f07c2b35b380efc4a9b99c5b1439277a0190af5061e8b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external URLs, many of which point to domains structured as SEO link farms. This suggests a tactic to drive traffic to potentially malicious or ad-filled sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://globalentre.org/uploads/1/3/1/4/131482808/131482808.html#al+kitaab+part+2+answer+key+3rd+edition
    • http://pof-updatecall.com/uploads/1/3/0/2/130272638/wararaduvada-bekaxekoj-venopulivali-memaporigif.pdf
    • http://diycreativehome.com/uploads/1/3/0/9/130969114/05a8c25.pdf
    • http://noelcsermak.com/uploads/1/3/0/7/130739037/9316652.pdf
    • http://realmrs.org/uploads/1/3/0/8/130813827/8d5606edc.pdf
    • http://bestelectricskateboard.net/uploads/1/3/0/4/130490193/3796865.pdf
    • http://siberianneva.com/uploads/1/3/0/2/130289096/51d78fdd52b909.pdf
    • http://akronautotowing.com/uploads/1/3/0/6/130604701/5631064.pdf
    • http://kancelariabarcinski.pl/uploads/1/3/0/5/130543059/kuwore_tomebixatubekef_zabukobedaj_vamuz.pdf
    • http://tradergreat.net/uploads/1/3/0/5/130544230/a5ad4.pdf
    • http://v-shapesurfboards.com/uploads/1/3/0/4/130483632/8ef412eaa78.pdf
    • http://limestreetnutrition.com/uploads/1/3/0/6/130604716/0c93b2acba7a.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_off00004e97.bin
ef1627a805ce0f5495da25eafeaa2a4b7d9e3d426d506599834d664d96538323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E97 6028 bytes

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